Condensed Consolidating Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
ASSETS
Cash and cash equivalents	$ 77,909	$ 62,804
Accounts receivable, net of allowance	244,957	247,084
Current deferred tax assets	9,241	8,022
Prepaid expenses and other current assets	20,612	26,383
Current assets of discontinued operations	15	6,449
Total current assets	352,734	350,742
Property and equipment, net	2,546,613	2,566,482
Restricted cash	5,589	5,022
Investment in direct financing lease	5,473	7,467
Goodwill	16,110	11,158
Non-current deferred tax assets	3,078
Other assets	77,828	30,701
Non-current assets of discontinued operations		3,170
Total assets	3,007,425	2,974,742
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	252,277	164,529
Income taxes payable	1,243	102
Current liabilities of discontinued operations	886	1,827
Total current liabilities	254,406	166,458
Long-term debt	1,205,000	1,111,545
Deferred tax liabilities		139,526
Other liabilities	45,512	35,593
Total liabilities	1,504,918	1,453,122
Total stockholders' equity	1,502,507	1,521,620	1,408,022	1,470,871
Total liabilities and stockholders' equity	3,007,425	2,974,742
Parent
ASSETS
Cash and cash equivalents	31,647
Accounts receivable, net of allowance	203,018	136,128
Current deferred tax assets	2	137
Prepaid expenses and other current assets	7,580	1,766
Total current assets	242,247	138,031
Property and equipment, net	2,450,028	2,462,917
Restricted cash	1,016
Investment in direct financing lease	5,473	7,467
Other assets	245,028	191,502
Total assets	2,943,792	2,799,917
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	234,277	28,061
Total current liabilities	234,277	28,061
Long-term debt	1,205,000	1,111,545
Deferred tax liabilities	555	138,691
Other liabilities	1,453
Total liabilities	1,441,285	1,278,297
Total stockholders' equity	1,502,507	1,521,620
Total liabilities and stockholders' equity	2,943,792	2,799,917
Combined Subsidiary Guarantors
ASSETS
Cash and cash equivalents	46,262	62,804
Accounts receivable, net of allowance	178,894	249,512
Current deferred tax assets	9,239	7,885
Prepaid expenses and other current assets	22,856	34,499
Current assets of discontinued operations	15	6,449
Total current assets	257,266	361,149
Property and equipment, net	96,585	103,565
Restricted cash	4,573	5,022
Goodwill	16,110	11,158
Non-current deferred tax assets	3,633
Other assets	45,149	114,922
Non-current assets of discontinued operations		3,170
Total assets	423,316	598,986
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	164,745	284,871
Income taxes payable	1,243	102
Current liabilities of discontinued operations	886	1,827
Total current liabilities	166,874	286,800
Long-term debt	115,000	100,000
Deferred tax liabilities		835
Other liabilities	44,059	35,593
Total liabilities	325,933	423,228
Total stockholders' equity	97,383	175,758
Total liabilities and stockholders' equity	423,316	598,986
Consolidating Adjustments and Other
ASSETS
Accounts receivable, net of allowance	(136,955)	(138,556)
Prepaid expenses and other current assets	(9,824)	(9,882)
Total current assets	(146,779)	(148,438)
Non-current deferred tax assets	(555)
Other assets	(212,349)	(275,723)
Total assets	(359,683)	(424,161)
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	(146,745)	(148,403)
Total current liabilities	(146,745)	(148,403)
Long-term debt	(115,000)	(100,000)
Deferred tax liabilities	(555)
Total liabilities	(262,300)	(248,403)
Total stockholders' equity	(97,383)	(175,758)
Total liabilities and stockholders' equity	$ (359,683)	$ (424,161)