Condensed Consolidating Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 65,291	$ 74,393
Restricted cash	877
Accounts receivable, net of allowance	234,456	248,588
Prepaid expenses and other current assets	41,434	29,775
Total current assets	342,058	352,756
Property and equipment, net	2,883,060	2,658,628
Restricted cash	131	2,858
Investment in direct financing lease	684	3,223
Goodwill	35,557	16,110
Non-current deferred tax assets	9,824	15,530
Other assets	84,704	68,541
Total assets	3,356,018	3,117,646
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	317,675	317,566
Income taxes payable	1,920	1,368
Current portion of long-term debt	5,000
Current liabilities of discontinued operations		54
Total current liabilities	324,595	318,988
Long-term debt, net of current portion	1,447,077	1,190,455
Deferred revenue	63,289	87,227
Other liabilities	58,309	39,476
Total liabilities	1,893,270	1,636,146
Total stockholders' equity	1,462,748	1,481,500	$ 1,502,507	$ 1,521,620
Total liabilities and stockholders' equity	3,356,018	3,117,646
Parent
ASSETS
Cash and cash equivalents	15,666	12,337
Restricted cash	637
Accounts receivable, net of allowance	300,632	167,626
Prepaid expenses and other current assets	3,760	17,060
Total current assets	320,695	197,023
Property and equipment, net	2,526,278	2,459,053
Restricted cash	131	1,267
Investment in direct financing lease	684	3,223
Goodwill	20,402
Other assets	241,510	233,607
Total assets	3,109,700	2,894,173
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	191,600	218,403
Income taxes payable		195
Current portion of long-term debt	5,000
Total current liabilities	196,600	218,598
Long-term debt, net of current portion	1,448,316	1,191,917
Non-current deferred tax liabilities	393	490
Other liabilities	1,643	1,668
Total liabilities	1,646,952	1,412,673
Total stockholders' equity	1,462,748	1,481,500
Total liabilities and stockholders' equity	3,109,700	2,894,173
Combined Subsidiary Guarantors
ASSETS
Cash and cash equivalents	49,625	62,056
Restricted cash	240
Accounts receivable, net of allowance	159,286	178,911
Prepaid expenses and other current assets	43,706	34,705
Total current assets	252,857	275,672
Property and equipment, net	356,782	199,575
Restricted cash		1,591
Goodwill	15,155	16,110
Non-current deferred tax assets	10,217	16,019
Other assets	57,120	45,584
Total assets	692,131	554,551
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	357,569	205,213
Income taxes payable	1,920	1,173
Note payable to an affiliate		13,854
Current liabilities of discontinued operations		54
Total current liabilities	359,489	220,294
Long-term debt, net of current portion	113,761	113,538
Deferred revenue	63,289	87,227
Other liabilities	56,666	37,808
Total liabilities	593,205	458,867
Total stockholders' equity	98,926	95,684
Total liabilities and stockholders' equity	692,131	554,551
Consolidating Adjustments and Other
ASSETS
Accounts receivable, net of allowance	(225,462)	(97,949)
Prepaid expenses and other current assets	(6,032)	(21,990)
Total current assets	(231,494)	(119,939)
Non-current deferred tax assets	(393)	(489)
Other assets	(213,926)	(210,650)
Total assets	(445,813)	(331,078)
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	(231,494)	(106,050)
Note payable to an affiliate		(13,854)
Total current liabilities	(231,494)	(119,904)
Long-term debt, net of current portion	(115,000)	(115,000)
Non-current deferred tax liabilities	(393)	(490)
Total liabilities	(346,887)	(235,394)
Total stockholders' equity	(98,926)	(95,684)
Total liabilities and stockholders' equity	$ (445,813)	$ (331,078)