Supplemental Condensed Consolidating Financial Information (Schedule of Condensed Consolidating Statement of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net cash (used in) provided by operating activities	$ 441,100	$ 777,865
Cash flows from investing activities:
Acquisitions of facilities and other related equipment	(33,935)	(312,927)
Purchases of property and equipment	(420,917)	(557,469)
Proceeds from sale of property and equipment	4,185	4,808
Increase in other investments	(234,099)	(222,164)
Net cash used in investing activities	(684,766)	(1,087,752)
Cash flows from financing activities:
Proceeds from exercise of stock options	108,546	5,750
Repurchase of restricted stock shares for payroll tax withholding requirements	(14,696)	(9,165)
Stock buy-back	(27,133)
Deferred financing costs	(12,960)	(135,647)
Excess tax benefit relating to stock-based compensation	6,573	1,545
Proceeds from noncontrolling investors in joint ventures	64	535
Redemption of noncontrolling investments in joint ventures	(5,720)	(39,709)
Distributions to noncontrolling investors in joint ventures	(60,282)	(60,676)
Borrowings under credit agreements	813,732	3,974,399
Issuance of long-term debt		3,825,000
Proceeds from receivables facility	320,000	300,000
Repayments of long-term indebtedness	(1,128,666)	(7,441,360)
Net cash (used in) provided by financing activities	(542)	420,672
Net change in cash and cash equivalents	(244,208)	110,785
Cash and cash equivalents at beginning of period	387,813	129,865
Cash and cash equivalents at end of period	143,605	240,650
Parent Company [Member]
Cash flows from operating activities:
Net cash (used in) provided by operating activities	(80,729)	(58,932)
Cash flows from financing activities:
Proceeds from exercise of stock options	108,546	5,750
Repurchase of restricted stock shares for payroll tax withholding requirements	(14,696)	(9,165)
Stock buy-back	(27,133)
Excess tax benefit relating to stock-based compensation	6,573	1,545
Changes in intercompany balances with affiliates, net	7,439	60,802
Net cash (used in) provided by financing activities	80,729	58,932
Subsidiary Issuer [Member]
Cash flows from operating activities:
Net cash (used in) provided by operating activities	5,644	(33,958)
Cash flows from financing activities:
Deferred financing costs	(12,960)	(135,647)
Changes in intercompany balances with affiliates, net	183,044	(189,385)
Borrowings under credit agreements	792,000	3,955,000
Issuance of long-term debt		3,825,000
Repayments of long-term indebtedness	(967,728)	(7,421,010)
Net cash (used in) provided by financing activities	(5,644)	33,958
Guarantor Subsidiaries [Member]
Cash flows from operating activities:
Net cash (used in) provided by operating activities	495,003	736,312
Cash flows from investing activities:
Acquisitions of facilities and other related equipment	(8,936)	(302,759)
Purchases of property and equipment	(355,603)	(374,940)
Proceeds from sale of property and equipment	1,441	2,281
Increase in other investments	(190,892)	(168,506)
Net cash used in investing activities	(553,990)	(843,924)
Cash flows from financing activities:
Changes in intercompany balances with affiliates, net	(196,342)	248,311
Borrowings under credit agreements	21,046	19,399
Repayments of long-term indebtedness	(20,281)	(18,983)
Net cash (used in) provided by financing activities	(195,577)	248,727
Net change in cash and cash equivalents	(254,564)	141,115
Cash and cash equivalents at beginning of period	271,559	8,920
Cash and cash equivalents at end of period	16,995	150,035
Non-Guarantor Subsidiaries [Member]
Cash flows from operating activities:
Net cash (used in) provided by operating activities	21,182	134,443
Cash flows from investing activities:
Acquisitions of facilities and other related equipment	(24,999)	(10,168)
Purchases of property and equipment	(65,314)	(182,529)
Proceeds from sale of property and equipment	2,744	2,527
Increase in other investments	(43,207)	(53,658)
Net cash used in investing activities	(130,776)	(243,828)
Cash flows from financing activities:
Proceeds from noncontrolling investors in joint ventures	64	535
Redemption of noncontrolling investments in joint ventures	(5,720)	(39,709)
Distributions to noncontrolling investors in joint ventures	(60,282)	(60,676)
Changes in intercompany balances with affiliates, net	5,859	(119,728)
Borrowings under credit agreements	686
Proceeds from receivables facility	320,000	300,000
Repayments of long-term indebtedness	(140,657)	(1,367)
Net cash (used in) provided by financing activities	119,950	79,055
Net change in cash and cash equivalents	10,356	(30,330)
Cash and cash equivalents at beginning of period	116,254	120,945
Cash and cash equivalents at end of period	$ 126,610	$ 90,615