13. Supplemental Consolidating Financial Data for Subsidiary Guarantors of the Unsecured Notes Supplemental Consolidating Statements of Operations (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues:
Base rent	$ 61,710,000	$ 55,773,000	$ 122,193,000	$ 108,943,000
Recoveries from tenants	29,047,000	25,728,000	55,386,000	49,814,000
Other revenues	807,000	1,157,000	1,744,000	2,283,000
Total revenues	91,564,000	82,658,000	179,323,000	161,040,000
Expenses:
Property operating costs	24,767,000	23,473,000	48,279,000	45,836,000
Real estate taxes and insurance	3,673,000	2,413,000	7,314,000	4,584,000
Depreciation and amortization	23,196,000	22,484,000	46,235,000	44,354,000
General and administrative	4,332,000	4,505,000	8,882,000	9,741,000
Other expenses	585,000	744,000	1,357,000	1,412,000
Total expenses	56,553,000	53,619,000	112,067,000	105,927,000
Operating income	35,011,000	29,039,000	67,256,000	55,113,000
Interest income	16,000	45,000	53,000	79,000
Interest:
Expense incurred	(12,505,000)	(12,674,000)	(25,442,000)	(24,537,000)
Amortization of financing costs including write-offs	(775,000)	(916,000)	(3,393,000)	(1,803,000)
Net income	21,747,000	15,494,000	38,474,000	28,852,000
Preferred stock dividends	(6,811,000)	(6,811,000)	(13,622,000)	(13,430,000)
Depreciation	22,200,000	21,300,000	44,200,000	42,000,000
DuPont Fabros Technology, L.P. [Member]
Revenues:
Base rent	61,710,000	55,773,000	122,193,000	108,943,000
Recoveries from tenants	29,047,000	25,728,000	55,386,000	49,814,000
Other revenues	807,000	1,157,000	1,744,000	2,283,000
Total revenues	91,564,000	82,658,000	179,323,000	161,040,000
Expenses:
Property operating costs	24,767,000	23,473,000	48,279,000	45,836,000
Real estate taxes and insurance	3,673,000	2,413,000	7,314,000	4,584,000
Depreciation and amortization	23,196,000	22,484,000	46,235,000	44,354,000
General and administrative	4,332,000	4,505,000	8,882,000	9,741,000
Other expenses	585,000	744,000	1,357,000	1,412,000
Total expenses	56,553,000	53,619,000	112,067,000	105,927,000
Operating income	35,011,000	29,039,000	67,256,000	55,113,000
Interest income	16,000	45,000	53,000	79,000
Interest:
Expense incurred	(12,505,000)	(12,674,000)	(25,442,000)	(24,537,000)
Amortization of financing costs including write-offs	(775,000)	(916,000)	(3,393,000)	(1,803,000)
Equity in earnings	0	0	0	0
Net income	21,747,000	15,494,000	38,474,000	28,852,000
Preferred stock dividends	(6,811,000)	(6,811,000)	(13,622,000)	(13,430,000)
Net Income Loss Available To Common Unit holders Basic	14,936,000	8,683,000	24,852,000	15,422,000
DuPont Fabros Technology, L.P. [Member] \| Operating Partnership [Member]
Revenues:
Base rent	0	0	0	0
Recoveries from tenants	3,728,000	3,377,000	7,377,000	6,709,000
Other revenues	0	0	0	0
Total revenues	3,728,000	3,377,000	7,377,000	6,709,000
Expenses:
Property operating costs	0	0	0	0
Real estate taxes and insurance	0	0	0	0
Depreciation and amortization	20,000	32,000	46,000	62,000
General and administrative	4,253,000	3,870,000	8,505,000	8,401,000
Other expenses	349,000	16,000	439,000	16,000
Total expenses	4,622,000	3,918,000	8,990,000	8,479,000
Operating income	(894,000)	(541,000)	(1,613,000)	(1,770,000)
Interest income	16,000	116,000	(232,000)	190,000
Interest:
Expense incurred	(12,205,000)	(11,887,000)	(24,264,000)	(23,719,000)
Amortization of financing costs including write-offs	(704,000)	(680,000)	(1,386,000)	(1,387,000)
Equity in earnings	35,534,000	28,486,000	65,969,000	55,538,000
Net income	21,747,000	15,494,000	38,474,000	28,852,000
Preferred stock dividends	(6,811,000)	(6,811,000)	(13,622,000)	(13,430,000)
Net Income Loss Available To Common Unit holders Basic	14,936,000	8,683,000	24,852,000	15,422,000
DuPont Fabros Technology, L.P. [Member] \| Subsidiary Guarantors [Member]
Revenues:
Base rent	57,767,000	51,313,000	114,308,000	100,034,000
Recoveries from tenants	26,573,000	22,454,000	50,539,000	43,829,000
Other revenues	397,000	293,000	809,000	598,000
Total revenues	84,737,000	74,060,000	165,656,000	144,461,000
Expenses:
Property operating costs	26,219,000	23,744,000	51,119,000	46,859,000
Real estate taxes and insurance	3,562,000	2,284,000	7,092,000	4,309,000
Depreciation and amortization	22,035,000	21,090,000	44,044,000	41,603,000
General and administrative	26,000	42,000	57,000	76,000
Other expenses	0	0	296,000	0
Total expenses	51,842,000	47,160,000	102,608,000	92,847,000
Operating income	32,895,000	26,900,000	63,048,000	51,614,000
Interest income	0	0	20,000	0
Interest:
Expense incurred	27,000	(787,000)	(1,015,000)	(818,000)
Amortization of financing costs including write-offs	2,000	(236,000)	(1,944,000)	(416,000)
Equity in earnings	0	0	0	0
Net income	32,924,000	25,877,000	60,109,000	50,380,000
Preferred stock dividends	0	0	0	0
Net Income Loss Available To Common Unit holders Basic	32,924,000	25,877,000	60,109,000	50,380,000
DuPont Fabros Technology, L.P. [Member] \| Subsidiary Non-Guarantors [Member]
Revenues:
Base rent	3,980,000	4,492,000	7,960,000	8,984,000
Recoveries from tenants	2,474,000	3,274,000	4,847,000	5,985,000
Other revenues	461,000	914,000	1,009,000	1,751,000
Total revenues	6,915,000	8,680,000	13,816,000	16,720,000
Expenses:
Property operating costs	2,327,000	3,156,000	4,611,000	5,752,000
Real estate taxes and insurance	111,000	129,000	222,000	275,000
Depreciation and amortization	1,141,000	1,362,000	2,145,000	2,689,000
General and administrative	53,000	593,000	320,000	1,264,000
Other expenses	273,000	760,000	697,000	1,471,000
Total expenses	3,905,000	6,000,000	7,995,000	11,451,000
Operating income	3,010,000	2,680,000	5,821,000	5,269,000
Interest income	0	0	0	0
Interest:
Expense incurred	(327,000)	(71,000)	102,000	(111,000)
Amortization of financing costs including write-offs	73,000	0	63,000	0
Equity in earnings	0	0	0	0
Net income	2,610,000	2,609,000	5,860,000	5,158,000
Preferred stock dividends	0	0	0	0
Net Income Loss Available To Common Unit holders Basic	2,610,000	2,609,000	5,860,000	5,158,000
DuPont Fabros Technology, L.P. [Member] \| Eliminations [Member]
Revenues:
Base rent	(37,000)	(32,000)	(75,000)	(75,000)
Recoveries from tenants	(3,728,000)	(3,377,000)	(7,377,000)	(6,709,000)
Other revenues	(51,000)	(50,000)	(74,000)	(66,000)
Total revenues	(3,816,000)	(3,459,000)	(7,526,000)	(6,850,000)
Expenses:
Property operating costs	(3,779,000)	(3,427,000)	(7,451,000)	(6,775,000)
Real estate taxes and insurance	0	0	0	0
Depreciation and amortization	0	0	0	0
General and administrative	0	0	0	0
Other expenses	(37,000)	(32,000)	(75,000)	(75,000)
Total expenses	(3,816,000)	(3,459,000)	(7,526,000)	(6,850,000)
Operating income	0	0	0	0
Interest income	0	(71,000)	265,000	(111,000)
Interest:
Expense incurred	0	71,000	(265,000)	111,000
Amortization of financing costs including write-offs	0	0	0	0
Equity in earnings	(35,534,000)	(28,486,000)	(65,969,000)	(55,538,000)
Net income	(35,534,000)	(28,486,000)	(65,969,000)	(55,538,000)
Preferred stock dividends	0	0	0	0
Net Income Loss Available To Common Unit holders Basic	$ (35,534,000)	$ (28,486,000)	$ (65,969,000)	$ (55,538,000)

DuPont Fabros Technology LP 10-Q