SUPPLEMENTAL SEGMENT INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended						6 Months Ended		12 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Dec. 31, 2010
Segment reporting information
Revenue	$ 680,612	$ 640,600	$ 596,943	$ 516,884	$ 485,404	$ 460,213	$ 1,321,212	$ 945,617	$ 2,059,444	$ 1,636,815
Operating Income (Loss)	97,476	62,765	55,455	46,740	58,231	37,336	160,241	95,567	197,762	49,795
Non-cash compensation expense	20,441	21,466	22,535	22,885	23,007	20,161	41,907	43,168	88,588	84,280
Amortization of intangibles and goodwill impairment		7,041	12,862	4,538	2,200	2,457			22,057	55,504
Operating Income Before Amortization	123,722	91,272	90,852	74,163	83,438	59,954	214,994	143,392	308,407	189,579
Depreciation	12,225	12,115	13,346	17,484	12,450	13,439	24,340	25,889	56,719	63,897
Search & Applications
Segment reporting information
Revenue	348,762	343,198	309,453	258,875	238,328	233,851	691,960	472,179	1,040,507	805,284
Operating Income (Loss)	74,067	73,490	59,226	45,508	50,651	48,621	147,557	99,272	204,006	128,356
Non-cash compensation expense	9	8	8	4	(291)	77	17	(214)	(202)	630
Amortization of intangibles and goodwill impairment		2	4	768	202	202			1,176	11,806
Operating Income Before Amortization	74,079	73,500	59,238	46,280	50,562	48,900	147,579	99,462	204,980	140,792
Depreciation	3,385	3,291	4,095	9,824	5,399	6,166	6,676	11,565	25,484	35,754
Match
Segment reporting information
Revenue	178,418	174,275	157,673	132,328	116,429	111,597	352,693	228,026	518,027	400,723
Operating Income (Loss)	57,099	29,906	36,450	36,677	40,999	23,429	87,005	64,428	137,555	115,367
Non-cash compensation expense	556	907	1,219	423			1,463		1,642	(153)
Amortization of intangibles and goodwill impairment		6,515	11,075	3,107	1,336	1,559			17,077	6,843
Operating Income Before Amortization	62,645	37,328	48,744	40,207	42,335	24,988	99,973	67,323	156,274	122,057
Depreciation	3,742	3,537	3,721	2,481	2,278	2,300	7,279	4,578	10,780	11,042
Local
Segment reporting information
Revenue	84,505	77,119	71,953	80,124	80,410	70,931	161,624	151,341	303,418	263,749
Operating Income (Loss)	11,670	3,789	3,049	7,324	9,326	5,834	15,459	15,160	25,533	8,405
Amortization of intangibles and goodwill impairment		161	1,399	443	442	467			2,751	2,266
Operating Income Before Amortization	11,832	3,950	4,448	7,767	9,768	6,301	15,782	16,069	28,284	10,671
Depreciation	2,475	2,801	3,063	2,738	2,392	2,195	5,276	4,587	10,388	7,785
Media
Segment reporting information
Revenue	38,368	15,911	18,353	18,692	19,511	13,608	54,279	33,119	70,164	49,692
Operating Income (Loss)	(7,305)	(6,669)	(5,730)	(2,837)	(3,390)	(4,318)	(13,974)	(7,708)	(16,275)	(23,385)
Non-cash compensation expense	236	268	186	186	88	(33)	504	55	427	458
Amortization of intangibles and goodwill impairment						3			3	1,078
Operating Income Before Amortization	(6,789)	(6,401)	(5,544)	(2,651)	(3,302)	(4,348)	(13,190)	(7,650)	(15,845)	(21,849)
Depreciation	295	179	157	153	88	305	474	393	703	245
Other
Segment reporting information
Revenue	30,629	30,206	39,623	27,023	30,894	30,525	60,835	61,419	128,065	118,749
Operating Income (Loss)	(2,182)	(1,714)	(5)	(1,648)	(1,278)	(965)	(3,896)	(2,243)	(3,896)	(31,600)
Non-cash compensation expense	57	(47)	92	89	83	83	10	166	347	180
Amortization of intangibles and goodwill impairment		363	384	220	220	226			1,050	33,511
Operating Income Before Amortization	(1,755)	(1,398)	471	(1,339)	(975)	(656)	(3,153)	(1,631)	(2,499)	2,091
Depreciation	257	244	228	209	220	194	501	414	851	828
Inter-segment elimination
Segment reporting information
Revenue	(70)	(109)	(112)	(158)	(168)	(299)	(179)	(467)	(737)	(1,382)
Corporate
Segment reporting information
Operating Income (Loss)	(35,873)	(36,037)	(37,535)	(38,284)	(38,077)	(35,265)	(71,910)	(73,342)	(149,161)	(147,348)
Non-cash compensation expense	19,583	20,330	21,030	22,183	23,127	20,034	39,913	43,161	86,374	83,165
Operating Income Before Amortization	(16,290)	(15,707)	(16,505)	(16,101)	(14,950)	(15,231)	(31,997)	(30,181)	(62,787)	(64,183)
Depreciation	$ 2,071	$ 2,063	$ 2,082	$ 2,079	$ 2,073	$ 2,279	$ 4,134	$ 4,352	$ 8,513	$ 8,243