INVESTMENTS, DERIVATIVE CONTRACTS AND OFF-BALANCE SHEET RISK (Details 5) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Trading profits (losses) of the Partnership's derivatives
Realized Profits (Losses)	$ (414,883)	$ (694,571)
Change in Net Unrealized Profits (Losses)	2,734,834	(2,804,583)
Net Trading Profits (Losses)	2,319,951	(3,499,154)
Futures
Trading profits (losses) of the Partnership's derivatives
Realized Profits (Losses)	1,872,765	1,370,451
Change in Net Unrealized Profits (Losses)	330,519	(1,986,816)
Net Trading Profits (Losses)	2,203,284	(616,365)
Futures \| Agriculture
Trading profits (losses) of the Partnership's derivatives
Realized Profits (Losses)	(583,304)	(1,530,728)
Change in Net Unrealized Profits (Losses)	215,265	280,592
Net Trading Profits (Losses)	(368,039)	(1,250,136)
Futures \| Currencies
Trading profits (losses) of the Partnership's derivatives
Realized Profits (Losses)	981,342	(1,231,137)
Change in Net Unrealized Profits (Losses)	(661,026)	(1,156,885)
Net Trading Profits (Losses)	320,316	(2,388,022)
Futures \| Energy
Trading profits (losses) of the Partnership's derivatives
Realized Profits (Losses)	(731,718)	2,741,587
Change in Net Unrealized Profits (Losses)	122,927	(132,445)
Net Trading Profits (Losses)	(608,791)	2,609,142
Futures \| Interest rates
Trading profits (losses) of the Partnership's derivatives
Realized Profits (Losses)	(1,144,639)	(876,154)
Change in Net Unrealized Profits (Losses)	288,811	(1,247,408)
Net Trading Profits (Losses)	(855,828)	(2,123,562)
Futures \| Metals
Trading profits (losses) of the Partnership's derivatives
Realized Profits (Losses)	(567,539)	(717,544)
Change in Net Unrealized Profits (Losses)	629,650	(32,450)
Net Trading Profits (Losses)	62,111	(749,994)
Futures \| Stock indices
Trading profits (losses) of the Partnership's derivatives
Realized Profits (Losses)	3,918,623	2,984,427
Change in Net Unrealized Profits (Losses)	(265,108)	301,780
Net Trading Profits (Losses)	3,653,515	3,286,207
Forwards \| Currencies
Trading profits (losses) of the Partnership's derivatives
Realized Profits (Losses)	(4,219,130)	(3,898,656)
Change in Net Unrealized Profits (Losses)	2,181,835	(775,347)
Net Trading Profits (Losses)	(2,037,295)	(4,674,003)
Options
Trading profits (losses) of the Partnership's derivatives
Realized Profits (Losses)	1,931,482	1,833,634
Change in Net Unrealized Profits (Losses)	222,480	(42,420)
Net Trading Profits (Losses)	2,153,962	1,791,214
Options \| Agriculture
Trading profits (losses) of the Partnership's derivatives
Realized Profits (Losses)	(23,411)
Change in Net Unrealized Profits (Losses)	45,542
Net Trading Profits (Losses)	22,131
Options \| Currencies
Trading profits (losses) of the Partnership's derivatives
Realized Profits (Losses)	608,495	249,441
Change in Net Unrealized Profits (Losses)	260,401	22,939
Net Trading Profits (Losses)	868,896	272,380
Options \| Energy
Trading profits (losses) of the Partnership's derivatives
Realized Profits (Losses)	312,614	121,571
Change in Net Unrealized Profits (Losses)	(54,751)	(1,822)
Net Trading Profits (Losses)	257,863	119,749
Options \| Interest rates
Trading profits (losses) of the Partnership's derivatives
Realized Profits (Losses)	1,055,296	1,181,962
Change in Net Unrealized Profits (Losses)	28,022	(40,217)
Net Trading Profits (Losses)	1,083,318	1,141,745
Options \| Metals
Trading profits (losses) of the Partnership's derivatives
Realized Profits (Losses)	(137,340)	(2,134)
Change in Net Unrealized Profits (Losses)	(59,385)
Net Trading Profits (Losses)	(196,725)	(2,134)
Options \| Stock indices
Trading profits (losses) of the Partnership's derivatives
Realized Profits (Losses)	115,828	282,794
Change in Net Unrealized Profits (Losses)	2,651	(23,320)
Net Trading Profits (Losses)	$ 118,479	$ 259,474

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of trading securities held at each balance sheet date, that was included in earnings for the period. Trading securities are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) and the change in net unrealized holding gain (loss) is included in earnings for the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-Name Statement of Financial Accounting Standard (FAS)

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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+ Details

BlackRock Global Horizons I L.P. 10-Q