Guarantor Subsidiaries Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash flows from operating activities:
Net cash (used in)/provided by operating activities - continuing operations	$ 171,592	$ 164,145	$ 250,653
Net cash (used in)/provided by operating activities - discontinued operations	(10,655)	42,049	308,266
Total cash (used in)/provided by operating activities	160,937	206,194	558,919
Cash flows from investing activities:
Purchase of subsidiary shares from and other decreases in noncontrolling interests	(72,000)	(385,847)	0
Payments to Acquire Interest in Subsidiaries and Affiliates	0	6,537	62,011
Purchases of property and equipment	(45,215)	(52,610)	(31,887)
Purchases of capitalized data and other intangible assets	(27,009)	(24,814)	(25,506)
Cash paid for acquisition, net of cash acquired	(214,215)	(9,228)	(10,000)
Cash received from sale of discontinued operations	0	265,000	0
Proceeds from sale of subsidiary and other increases in noncontrolling interests, net	(26,898)	(27,284)	(10,008)
Noncontrolling Interest, Increase from Equity Issuance or Sale of Parent Equity Interest	28,054	0	12,347
Proceeds from Sale of Property, Plant, and Equipment	(25,042)	0	0
Proceeds from maturities of debt securities	0	371	12,623
Proceeds from sale of investments	74,621	26,386	4,488
Proceeds from Sale of Notes Receivable	0	(12,754)	0
Increase (Decrease) in Restricted Cash	2,091	(21,095)	0
Net cash (used in)/provided by investing activities - continuing operations	(255,529)	(248,412)	(109,954)
Net cash used in investing activities - discontinued operations	(4,497)	(76,192)	(4,124)
Total cash (used in)/provided by investing activities	(260,026)	(324,604)	(114,078)
Cash flows from financing activities:
Proceeds from long-term debt	858,154	843,524	50,782
Debt Issuance Costs	(22,810)	(14,776)	0
Repayments of long-term debt	(733,407)	(713,643)	(102,188)
Share repurchases	(176,512)	(30,171)	0
Proceeds from issuance of stock related to stock options and employee benefit plans	1,064	6,997	12,601
Distribution to noncontrolling interests	(4,835)	(27,800)	(31,525)
Cash dividends	0	22,657	82,054
Tax benefit related to stock options	363	3,423	768
Net cash provided by/(used in) financing activities - continuing operations	(77,983)	44,897	(151,616)
Net cash provided by financing activities - discontinued operations	71	29,087	(198,276)
Total cash provided by (used in) financing activities	(77,912)	73,984	(349,892)
Net increase/(decrease) in cash and cash equivalents	(177,001)	(44,426)	94,949
Cash and cash equivalents at beginning of year	426,212	459,519	283,119
Change in cash and cash equivalents of discontinued operations	10,055	11,119	81,451
Cash and cash equivalents at end of year	259,266	426,212	459,519
Guarantor Subsidiaries [Member]
Cash flows from operating activities:
Net cash (used in)/provided by operating activities - continuing operations	176,002	224,975	302,141
Net cash (used in)/provided by operating activities - discontinued operations	(10,655)	18,598	9,538
Total cash (used in)/provided by operating activities	165,347	243,573	311,679
Cash flows from investing activities:
Purchase of subsidiary shares from and other decreases in noncontrolling interests	0	0
Payments to Acquire Interest in Subsidiaries and Affiliates		0	(3,500)
Purchases of property and equipment	(38,503)	48,114	(18,376)
Purchases of capitalized data and other intangible assets	(26,447)	(24,814)	25,506
Cash paid for acquisition, net of cash acquired	4,220	11,401	10,000
Cash received from sale of discontinued operations	0	0
Proceeds from sale of subsidiary and other increases in noncontrolling interests, net	(27,623)	8,520	10,008
Noncontrolling Interest, Increase from Equity Issuance or Sale of Parent Equity Interest	5,300		0
Proceeds from Sale of Property, Plant, and Equipment	(25,042)
Proceeds from maturities of debt securities		371	12,623
Proceeds from sale of investments	74,621	26,386	4,488
Proceeds from Sale of Notes Receivable		(12,754)
Increase (Decrease) in Restricted Cash	(1)	122	0
Net cash (used in)/provided by investing activities - continuing operations	16,609	(78,968)	(50,279)
Net cash used in investing activities - discontinued operations	(4,497)	(5,656)	(5,504)
Total cash (used in)/provided by investing activities	12,112	(84,624)	(55,783)
Cash flows from financing activities:
Proceeds from long-term debt	54,544	0	50,783
Debt Issuance Costs	0	0
Repayments of long-term debt	(107,094)	22,385	102,188
Share repurchases	0	0
Proceeds from issuance of stock related to stock options and employee benefit plans	0	0	0
Distribution to noncontrolling interests	0	0	0
Cash dividends		0	0
Tax benefit related to stock options	0	0	(289)
Other	(148,942)	(382,899)	(105,564)
Net cash provided by/(used in) financing activities - continuing operations	(201,492)	(405,284)	(157,258)
Net cash provided by financing activities - discontinued operations	71	0	0
Total cash provided by (used in) financing activities	(201,421)	(405,284)	(157,258)
Net increase/(decrease) in cash and cash equivalents	(23,962)	(246,335)	98,638
Cash and cash equivalents at beginning of year	23,013	282,290	187,688
Change in cash and cash equivalents of discontinued operations	10,055	(12,942)	(4,036)
Cash and cash equivalents at end of year	9,106	23,013	282,290
Non-Guarantor Subsidiaries [Member]
Cash flows from operating activities:
Net cash (used in)/provided by operating activities - continuing operations	7,015	8,083	943
Net cash (used in)/provided by operating activities - discontinued operations	0	23,451	298,728
Total cash (used in)/provided by operating activities	7,015	31,534	299,671
Cash flows from investing activities:
Purchase of subsidiary shares from and other decreases in noncontrolling interests	0	0
Payments to Acquire Interest in Subsidiaries and Affiliates		0	0
Purchases of property and equipment	(5,927)	1,149	(1,159)
Purchases of capitalized data and other intangible assets	(562)	0	0
Cash paid for acquisition, net of cash acquired	882	(2,173)	0
Cash received from sale of discontinued operations	0	265,000
Proceeds from sale of subsidiary and other increases in noncontrolling interests, net	0	0	0
Noncontrolling Interest, Increase from Equity Issuance or Sale of Parent Equity Interest	0		0
Proceeds from Sale of Property, Plant, and Equipment	0
Proceeds from maturities of debt securities		0	0
Proceeds from sale of investments	0	0	0
Proceeds from Sale of Notes Receivable		0
Increase (Decrease) in Restricted Cash	(583)	0	0
Net cash (used in)/provided by investing activities - continuing operations	(6,190)	266,024	(1,159)
Net cash used in investing activities - discontinued operations	0	(70,536)	1,380
Total cash (used in)/provided by investing activities	(6,190)	195,488	221
Cash flows from financing activities:
Proceeds from long-term debt	53,610	0	0
Debt Issuance Costs	0	0
Repayments of long-term debt	(50,526)	0	0
Share repurchases	0	0
Proceeds from issuance of stock related to stock options and employee benefit plans	0	0	0
Distribution to noncontrolling interests	0	0	0
Cash dividends		0	0
Tax benefit related to stock options	0	0	0
Other	(30,845)	(245,162)	(185,835)
Net cash provided by/(used in) financing activities - continuing operations	(27,761)	(245,162)	(185,835)
Net cash provided by financing activities - discontinued operations	0	29,087	(198,276)
Total cash provided by (used in) financing activities	(27,761)	(216,075)	(384,111)
Net increase/(decrease) in cash and cash equivalents	(26,936)	10,947	(84,219)
Cash and cash equivalents at beginning of year	47,225	12,217	10,949
Change in cash and cash equivalents of discontinued operations	0	24,061	85,487
Cash and cash equivalents at end of year	20,289	47,225	12,217
Consolidation, Eliminations [Member]
Cash flows from operating activities:
Net cash (used in)/provided by operating activities - continuing operations	0	0	0
Net cash (used in)/provided by operating activities - discontinued operations	0	0	0
Total cash (used in)/provided by operating activities	0	0	0
Cash flows from investing activities:
Purchase of subsidiary shares from and other decreases in noncontrolling interests	0	0
Payments to Acquire Interest in Subsidiaries and Affiliates		0	0
Purchases of property and equipment	0	0	0
Purchases of capitalized data and other intangible assets	0	0	0
Cash paid for acquisition, net of cash acquired	0	0	0
Cash received from sale of discontinued operations	0	0
Proceeds from sale of subsidiary and other increases in noncontrolling interests, net	0	0	0
Noncontrolling Interest, Increase from Equity Issuance or Sale of Parent Equity Interest	0		0
Proceeds from Sale of Property, Plant, and Equipment	0
Proceeds from maturities of debt securities		0	0
Proceeds from sale of investments	0	0	0
Proceeds from Sale of Notes Receivable		0
Increase (Decrease) in Restricted Cash	0	0	0
Net cash (used in)/provided by investing activities - continuing operations	0	0	0
Net cash used in investing activities - discontinued operations	0	0	0
Total cash (used in)/provided by investing activities	0	0	0
Cash flows from financing activities:
Proceeds from long-term debt	0	0	0
Debt Issuance Costs	0	0
Repayments of long-term debt	0	0	0
Share repurchases	0	0
Proceeds from issuance of stock related to stock options and employee benefit plans	0	0	0
Distribution to noncontrolling interests	0	0	0
Cash dividends		0	0
Tax benefit related to stock options	0	0	0
Other	0	0	0
Net cash provided by/(used in) financing activities - continuing operations	0	0	0
Net cash provided by financing activities - discontinued operations	0	0	0
Total cash provided by (used in) financing activities	0	0	0
Net increase/(decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents at beginning of year	0	0	0
Change in cash and cash equivalents of discontinued operations	0	0	0
Cash and cash equivalents at end of year	0	0	0
Total [Member]
Cash flows from operating activities:
Net cash (used in)/provided by operating activities - continuing operations	171,592	164,145	250,653
Net cash (used in)/provided by operating activities - discontinued operations	(10,655)	42,049	308,266
Total cash (used in)/provided by operating activities	160,937	206,194	558,919
Cash flows from investing activities:
Purchase of subsidiary shares from and other decreases in noncontrolling interests	(72,000)	385,847
Payments to Acquire Interest in Subsidiaries and Affiliates		(6,537)	(62,011)
Purchases of property and equipment	(45,215)	52,610	31,887
Purchases of capitalized data and other intangible assets	(27,009)	24,814	25,506
Cash paid for acquisition, net of cash acquired	(214,215)	9,228	10,000
Cash received from sale of discontinued operations	0	265,000
Proceeds from sale of subsidiary and other increases in noncontrolling interests, net	(26,898)	27,284	10,008
Noncontrolling Interest, Increase from Equity Issuance or Sale of Parent Equity Interest	28,054		(12,347)
Proceeds from Sale of Property, Plant, and Equipment	25,042
Proceeds from maturities of debt securities		371	12,623
Proceeds from sale of investments	74,621	26,386	4,488
Proceeds from Sale of Notes Receivable		(12,754)
Increase (Decrease) in Restricted Cash	2,091	21,095	0
Net cash (used in)/provided by investing activities - continuing operations	(255,529)	(248,412)	(109,954)
Net cash used in investing activities - discontinued operations	(4,497)	(76,192)	(4,124)
Total cash (used in)/provided by investing activities	(260,026)	(324,604)	(114,078)
Cash flows from financing activities:
Proceeds from long-term debt	858,154	843,524	50,782
Debt Issuance Costs	(22,810)	14,776
Repayments of long-term debt	(733,407)	713,643	102,188
Share repurchases	(176,512)	30,171
Proceeds from issuance of stock related to stock options and employee benefit plans	1,064	6,997	12,601
Distribution to noncontrolling interests	(4,835)	27,800	31,525
Cash dividends		(22,657)	(82,054)
Tax benefit related to stock options	363	3,423	768
Other	0	0	0
Net cash provided by/(used in) financing activities - continuing operations	(77,983)	44,897	(151,616)
Net cash provided by financing activities - discontinued operations	71	29,087	(198,276)
Total cash provided by (used in) financing activities	(77,912)	73,984	(349,892)
Net increase/(decrease) in cash and cash equivalents	(177,001)	(44,426)	94,949
Cash and cash equivalents at beginning of year	426,212	459,519	283,119
Change in cash and cash equivalents of discontinued operations	10,055	11,119	81,451
Cash and cash equivalents at end of year	259,266	426,212	459,519
Parent Company [Member]
Cash flows from operating activities:
Net cash (used in)/provided by operating activities - continuing operations	(11,425)	(68,913)	(52,431)
Net cash (used in)/provided by operating activities - discontinued operations	0	0	0
Total cash (used in)/provided by operating activities	(11,425)	(68,913)	(52,431)
Cash flows from investing activities:
Purchase of subsidiary shares from and other decreases in noncontrolling interests	(72,000)	385,847
Payments to Acquire Interest in Subsidiaries and Affiliates		(6,537)	(58,511)
Purchases of property and equipment	(785)	3,347	(12,352)
Purchases of capitalized data and other intangible assets	0	0	0
Cash paid for acquisition, net of cash acquired	(219,317)	0	0
Cash received from sale of discontinued operations	0	0
Proceeds from sale of subsidiary and other increases in noncontrolling interests, net	725	18,764	0
Noncontrolling Interest, Increase from Equity Issuance or Sale of Parent Equity Interest	22,754		(12,347)
Proceeds from Sale of Property, Plant, and Equipment	0
Proceeds from maturities of debt securities		0	0
Proceeds from sale of investments	0	0	0
Proceeds from Sale of Notes Receivable		0
Increase (Decrease) in Restricted Cash	2,675	20,973	0
Net cash (used in)/provided by investing activities - continuing operations	(265,948)	(435,468)	(58,516)
Net cash used in investing activities - discontinued operations	0	0	0
Total cash (used in)/provided by investing activities	(265,948)	(435,468)	(58,516)
Cash flows from financing activities:
Proceeds from long-term debt	750,000	843,524	(1)
Debt Issuance Costs	(22,810)	14,776
Repayments of long-term debt	(575,787)	691,258	0
Share repurchases	(176,512)	30,171
Proceeds from issuance of stock related to stock options and employee benefit plans	1,064	6,997	12,601
Distribution to noncontrolling interests	(4,835)	27,800	31,525
Cash dividends		(22,657)	(82,054)
Tax benefit related to stock options	363	3,423	1,057
Other	179,787	628,061	291,399
Net cash provided by/(used in) financing activities - continuing operations	151,270	695,343	191,477
Net cash provided by financing activities - discontinued operations	0	0	0
Total cash provided by (used in) financing activities	151,270	695,343	191,477
Net increase/(decrease) in cash and cash equivalents	(126,103)	190,962	80,530
Cash and cash equivalents at beginning of year	355,974	165,012	84,482
Change in cash and cash equivalents of discontinued operations	0	0	0
Cash and cash equivalents at end of year	$ 229,871	$ 355,974	$ 165,012