Condensed Consolidating Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
ASSETS
Cash and cash equivalents	$ 37,711	$ 65,291
Restricted cash		877
Accounts receivable, net of allowance	229,885	234,456
Prepaid expenses and other current assets	31,228	41,434
Total current assets	298,824	342,058
Property and equipment, net	2,837,657	2,883,060
Restricted cash	218	131
Investment in direct financing lease		684
Goodwill	38,386	35,557
Non-current deferred tax assets	13,735	9,824
Other assets	82,784	84,704
Total assets	3,271,604	3,356,018
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	260,107	317,675
Income taxes payable	2,086	1,920
Current portion of long-term debt	10,000	5,000
Total current liabilities	272,193	324,595
Long-term debt, net	1,435,169	1,447,077
Deferred revenue	53,437	63,289
Other liabilities	51,842	58,309
Total liabilities	1,812,641	1,893,270
Total stockholders' equity	1,458,963	1,462,748	$ 1,481,500	$ 1,502,507
Total liabilities and stockholders' equity	3,271,604	3,356,018
Parent
ASSETS
Cash and cash equivalents	11,378	15,666
Restricted cash		637
Accounts receivable, net of allowance	237,495	300,632
Prepaid expenses and other current assets	7,582	3,760
Total current assets	256,455	320,695
Property and equipment, net	2,493,025	2,526,278
Restricted cash	218	131
Investment in direct financing lease		684
Goodwill	23,231	20,402
Other assets	339,173	241,510
Total assets	3,112,102	3,109,700
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	203,074	191,600
Income taxes payable	1,850
Current portion of long-term debt	10,000	5,000
Total current liabilities	214,924	196,600
Long-term debt, net	1,436,186	1,448,316
Non-current deferred tax liabilities	321	393
Other liabilities	1,708	1,643
Total liabilities	1,653,139	1,646,952
Total stockholders' equity	1,458,963	1,462,748
Total liabilities and stockholders' equity	3,112,102	3,109,700
Combined Subsidiary Guarantors
ASSETS
Cash and cash equivalents	26,333	49,625
Restricted cash		240
Accounts receivable, net of allowance	270,952	159,286
Prepaid expenses and other current assets	30,123	43,706
Total current assets	327,408	252,857
Property and equipment, net	344,632	356,782
Goodwill	15,155	15,155
Non-current deferred tax assets	14,056	10,217
Other assets	57,873	57,120
Total assets	759,124	692,131
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	342,072	357,569
Income taxes payable	236	1,920
Total current liabilities	342,308	359,489
Long-term debt, net	113,983	113,761
Deferred revenue	53,437	63,289
Other liabilities	50,134	56,666
Total liabilities	559,862	593,205
Total stockholders' equity	199,262	98,926
Total liabilities and stockholders' equity	759,124	692,131
Consolidating Adjustments and Other
ASSETS
Accounts receivable, net of allowance	(278,562)	(225,462)
Prepaid expenses and other current assets	(6,477)	(6,032)
Total current assets	(285,039)	(231,494)
Non-current deferred tax assets	(321)	(393)
Other assets	(314,262)	(213,926)
Total assets	(599,622)	(445,813)
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	(285,039)	(231,494)
Total current liabilities	(285,039)	(231,494)
Long-term debt, net	(115,000)	(115,000)
Non-current deferred tax liabilities	(321)	(393)
Total liabilities	(400,360)	(346,887)
Total stockholders' equity	(199,262)	(98,926)
Total liabilities and stockholders' equity	$ (599,622)	$ (445,813)