Condensed Consolidating Balance Sheet (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
ASSETS
Cash and cash equivalents	$ 42,731	$ 65,291
Restricted cash		877
Accounts receivable, net of allowance	222,420	234,456
Prepaid expenses and other current assets	32,742	41,434
Total current assets	297,893	342,058
Property and equipment, net	2,850,219	2,883,060
Restricted cash	218	131
Investment in direct financing lease		684
Goodwill	38,386	35,557
Non-current deferred tax assets	11,973	9,824
Other assets	86,823	84,704
Total assets	3,285,512	3,356,018
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	329,446	317,675
Income taxes payable	1,627	1,920
Current portion of long-term debt	8,750	5,000
Total current liabilities	339,823	324,595
Long-term debt, net	1,420,155	1,447,077
Deferred revenue	36,257	63,289
Other liabilities	45,084	58,309
Total liabilities	1,841,319	1,893,270
Total stockholders' equity	1,444,193	1,462,748	$ 1,473,881	$ 1,481,500
Total liabilities and stockholders' equity	3,285,512	3,356,018
Parent
ASSETS
Cash and cash equivalents	22,704	15,666
Restricted cash		637
Accounts receivable, net of allowance	241,507	300,632
Prepaid expenses and other current assets	3,020	3,760
Total current assets	267,231	320,695
Property and equipment, net	2,499,353	2,526,278
Restricted cash	218	131
Investment in direct financing lease		684
Goodwill	23,231	20,402
Other assets	343,811	241,510
Total assets	3,133,844	3,109,700
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	256,522	191,600
Income taxes payable	1,374
Current portion of long-term debt	8,750	5,000
Total current liabilities	266,646	196,600
Long-term debt, net	1,421,228	1,448,316
Non-current deferred tax liabilities	322	393
Other liabilities	1,455	1,643
Total liabilities	1,689,651	1,646,952
Total stockholders' equity	1,444,193	1,462,748
Total liabilities and stockholders' equity	3,133,844	3,109,700
Combined Subsidiary Guarantors
ASSETS
Cash and cash equivalents	20,027	49,625
Restricted cash		240
Accounts receivable, net of allowance	284,022	159,286
Prepaid expenses and other current assets	35,832	43,706
Total current assets	339,881	252,857
Property and equipment, net	350,866	356,782
Goodwill	15,155	15,155
Non-current deferred tax assets	12,295	10,217
Other assets	60,626	57,120
Total assets	778,823	692,131
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	382,143	357,569
Income taxes payable	253	1,920
Total current liabilities	382,396	359,489
Long-term debt, net	113,927	113,761
Deferred revenue	36,257	63,289
Other liabilities	43,629	56,666
Total liabilities	576,209	593,205
Total stockholders' equity	202,614	98,926
Total liabilities and stockholders' equity	778,823	692,131
Consolidating Adjustments and Other
ASSETS
Accounts receivable, net of allowance	(303,109)	(225,462)
Prepaid expenses and other current assets	(6,110)	(6,032)
Total current assets	(309,219)	(231,494)
Non-current deferred tax assets	(322)	(393)
Other assets	(317,614)	(213,926)
Total assets	(627,155)	(445,813)
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	(309,219)	(231,494)
Total current liabilities	(309,219)	(231,494)
Long-term debt, net	(115,000)	(115,000)
Non-current deferred tax liabilities	(322)	(393)
Total liabilities	(424,541)	(346,887)
Total stockholders' equity	(202,614)	(98,926)
Total liabilities and stockholders' equity	$ (627,155)	$ (445,813)