Condensed Consolidating Balance Sheet (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
ASSETS
Cash and cash equivalents	$ 54,816	$ 65,291
Restricted cash		877
Accounts receivable, net of allowance	208,304	234,456
Prepaid expenses and other current assets	28,641	41,434
Total current assets	291,761	342,058
Property and equipment, net	2,854,109	2,883,060
Restricted cash	218	131
Investment in direct financing lease		684
Goodwill	35,001	35,557
Non-current deferred tax assets	8,949	9,824
Other assets	83,766	84,704
Total assets	3,273,804	3,356,018
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	308,576	317,675
Income taxes payable	2,421	1,920
Current portion of long-term debt	6,250	5,000
Total current liabilities	317,247	324,595
Long-term debt, net of current portion	1,400,128	1,447,077
Deferred revenue	54,641	63,289
Other liabilities	55,332	58,309
Total liabilities	1,827,348	1,893,270
Total stockholders' equity	1,446,456	1,462,748	$ 1,473,616	$ 1,481,500
Total liabilities and stockholders' equity	3,273,804	3,356,018
Parent
ASSETS
Cash and cash equivalents	9,989	15,666
Restricted cash		637
Accounts receivable, net of allowance	259,068	300,632
Prepaid expenses and other current assets	2,212	3,760
Total current assets	271,269	320,695
Property and equipment, net	2,513,336	2,526,278
Restricted cash	218	131
Investment in direct financing lease		684
Goodwill	19,846	20,402
Other assets	268,290	241,510
Total assets	3,072,959	3,109,700
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	217,902	191,600
Current portion of long-term debt	6,250	5,000
Total current liabilities	224,152	196,600
Long-term debt, net of current portion	1,401,312	1,448,316
Non-current deferred tax liabilities	289	393
Other liabilities	750	1,643
Total liabilities	1,626,503	1,646,952
Total stockholders' equity	1,446,456	1,462,748
Total liabilities and stockholders' equity	3,072,959	3,109,700
Combined Subsidiary Guarantors
ASSETS
Cash and cash equivalents	44,827	49,625
Restricted cash		240
Accounts receivable, net of allowance	181,627	159,286
Prepaid expenses and other current assets	32,513	43,706
Total current assets	258,967	252,857
Property and equipment, net	340,773	356,782
Goodwill	15,155	15,155
Non-current deferred tax assets	9,238	10,217
Other assets	57,057	57,120
Total assets	681,190	692,131
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	329,149	357,569
Income taxes payable	2,421	1,920
Total current liabilities	331,570	359,489
Long-term debt, net of current portion	113,816	113,761
Deferred revenue	54,641	63,289
Other liabilities	54,582	56,666
Total liabilities	554,609	593,205
Total stockholders' equity	126,581	98,926
Total liabilities and stockholders' equity	681,190	692,131
Consolidating Adjustments and Other
ASSETS
Accounts receivable, net of allowance	(232,391)	(225,462)
Prepaid expenses and other current assets	(6,084)	(6,032)
Total current assets	(238,475)	(231,494)
Non-current deferred tax assets	(289)	(393)
Other assets	(241,581)	(213,926)
Total assets	(480,345)	(445,813)
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	(238,475)	(231,494)
Total current liabilities	(238,475)	(231,494)
Long-term debt, net of current portion	(115,000)	(115,000)
Non-current deferred tax liabilities	(289)	(393)
Total liabilities	(353,764)	(346,887)
Total stockholders' equity	(126,581)	(98,926)
Total liabilities and stockholders' equity	$ (480,345)	$ (445,813)