SUPPLEMENTAL GUARANTOR INFORMATION - Condensed Consolidated Statement of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	$ 104,417	$ 31,222
Investing activities:
Purchases of property and equipment	(15,361)	(9,870)
Net cash used in investing activities	(15,361)	(9,870)
Financing activities:
(Increase) decrease of restricted cash	142	(256)
Payments under notes payable obligations	(77,439)	(26,881)
Principal repayments on capital lease obligations	(987)	(1,459)
Proceeds from issuance of stock	4,315	150
Tax benefit from equity awards	0	323
Repurchase of restricted stock awards and common stock	(13,604)	(12,469)
(Distribution to) investment by parent	0	0
Net cash used in financing activities	(87,573)	(40,592)
Effect of foreign exchange rates on cash and cash equivalents	(208)	(13)
Net (decrease) increase in cash and cash equivalents	1,275	(19,253)
Cash and cash equivalents at beginning of period	45,773	89,097
Cash and cash equivalents at end of period	47,048	69,844
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(68,589)	(42,414)
Investing activities:
Purchases of property and equipment	0	0
Net cash used in investing activities	0	0
Financing activities:
(Increase) decrease of restricted cash	0	0
Payments under notes payable obligations	0	0
Principal repayments on capital lease obligations	0	0
Proceeds from issuance of stock	0	0
Tax benefit from equity awards		0
Repurchase of restricted stock awards and common stock	0	0
(Distribution to) investment by parent	68,589	42,414
Net cash used in financing activities	68,589	42,414
Effect of foreign exchange rates on cash and cash equivalents	0	0
Net (decrease) increase in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0	0
NeuStar, Inc.
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	110,361	29,576
Investing activities:
Purchases of property and equipment	(13,528)	(8,037)
Net cash used in investing activities	(13,528)	(8,037)
Financing activities:
(Increase) decrease of restricted cash	0	0
Payments under notes payable obligations	(77,439)	(26,881)
Principal repayments on capital lease obligations	(987)	(1,459)
Proceeds from issuance of stock	4,315	150
Tax benefit from equity awards		323
Repurchase of restricted stock awards and common stock	(13,604)	(12,469)
(Distribution to) investment by parent	0	0
Net cash used in financing activities	(87,715)	(40,336)
Effect of foreign exchange rates on cash and cash equivalents	1,023	1,099
Net (decrease) increase in cash and cash equivalents	10,141	(17,698)
Cash and cash equivalents at beginning of period	21,871	48,061
Cash and cash equivalents at end of period	32,012	30,363
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	63,083	49,676
Investing activities:
Purchases of property and equipment	(1,833)	(1,833)
Net cash used in investing activities	(1,833)	(1,833)
Financing activities:
(Increase) decrease of restricted cash	142	(256)
Payments under notes payable obligations	0	0
Principal repayments on capital lease obligations	0	0
Proceeds from issuance of stock	0	0
Tax benefit from equity awards		0
Repurchase of restricted stock awards and common stock	0	0
(Distribution to) investment by parent	(69,087)	(42,962)
Net cash used in financing activities	(68,945)	(43,218)
Effect of foreign exchange rates on cash and cash equivalents	(9)	(11)
Net (decrease) increase in cash and cash equivalents	(7,704)	4,614
Cash and cash equivalents at beginning of period	15,037	27,092
Cash and cash equivalents at end of period	7,333	31,706
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) operating activities	(438)	(5,616)
Investing activities:
Purchases of property and equipment	0	0
Net cash used in investing activities	0	0
Financing activities:
(Increase) decrease of restricted cash	0	0
Payments under notes payable obligations	0	0
Principal repayments on capital lease obligations	0	0
Proceeds from issuance of stock	0	0
Tax benefit from equity awards		0
Repurchase of restricted stock awards and common stock	0	0
(Distribution to) investment by parent	498	548
Net cash used in financing activities	498	548
Effect of foreign exchange rates on cash and cash equivalents	(1,222)	(1,101)
Net (decrease) increase in cash and cash equivalents	(1,162)	(6,169)
Cash and cash equivalents at beginning of period	8,865	13,944
Cash and cash equivalents at end of period	$ 7,703	$ 7,775

NEUSTAR INC 10-Q