Condensed Consolidating Balance Sheet (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
ASSETS
Cash and cash equivalents	$ 70,843	$ 65,291
Restricted cash		877
Accounts receivable, net of allowance	221,427	234,456
Prepaid expenses and other current assets	32,995	41,434
Total current assets	325,265	342,058
Property and equipment, net	2,870,150	2,883,060
Restricted cash	218	131
Investment in direct financing lease		684
Goodwill	38,415	35,557
Non-current deferred tax assets	7,774	9,824
Other assets	85,928	84,704
Total assets	3,327,750	3,356,018
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	332,859	317,675
Income taxes payable	1,139	1,920
Current portion of long-term debt	7,500	5,000
Total current liabilities	341,498	324,595
Long-term debt, net	1,448,142	1,447,077
Deferred revenue	45,608	63,289
Other liabilities	47,875	58,309
Total liabilities	1,883,123	1,893,270
Total stockholders' equity	1,444,627	1,462,748	$ 1,481,161	$ 1,481,500
Total liabilities and stockholders' equity	3,327,750	3,356,018
Parent
ASSETS
Cash and cash equivalents	20,641	15,666
Restricted cash		637
Accounts receivable, net of allowance	262,953	300,632
Prepaid expenses and other current assets	3,836	3,760
Total current assets	287,430	320,695
Property and equipment, net	2,506,346	2,526,278
Restricted cash	218	131
Investment in direct financing lease		684
Goodwill	23,260	20,402
Other assets	305,404	241,510
Total assets	3,122,658	3,109,700
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	218,944	191,600
Income taxes payable	908
Current portion of long-term debt	7,500	5,000
Total current liabilities	227,352	196,600
Long-term debt, net	1,449,270	1,448,316
Non-current deferred tax liabilities	311	393
Other liabilities	1,098	1,643
Total liabilities	1,678,031	1,646,952
Total stockholders' equity	1,444,627	1,462,748
Total liabilities and stockholders' equity	3,122,658	3,109,700
Combined Subsidiary Guarantors
ASSETS
Cash and cash equivalents	50,202	49,625
Restricted cash		240
Accounts receivable, net of allowance	234,914	159,286
Prepaid expenses and other current assets	35,345	43,706
Total current assets	320,461	252,857
Property and equipment, net	363,804	356,782
Goodwill	15,155	15,155
Non-current deferred tax assets	8,085	10,217
Other assets	59,140	57,120
Total assets	766,645	692,131
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	396,542	357,569
Income taxes payable	231	1,920
Total current liabilities	396,773	359,489
Long-term debt, net	113,872	113,761
Deferred revenue	45,608	63,289
Other liabilities	46,777	56,666
Total liabilities	603,030	593,205
Total stockholders' equity	163,615	98,926
Total liabilities and stockholders' equity	766,645	692,131
Consolidating Adjustments and Other
ASSETS
Accounts receivable, net of allowance	(276,440)	(225,462)
Prepaid expenses and other current assets	(6,186)	(6,032)
Total current assets	(282,626)	(231,494)
Non-current deferred tax assets	(311)	(393)
Other assets	(278,616)	(213,926)
Total assets	(561,553)	(445,813)
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	(282,627)	(231,494)
Total current liabilities	(282,627)	(231,494)
Long-term debt, net	(115,000)	(115,000)
Non-current deferred tax liabilities	(311)	(393)
Total liabilities	(397,938)	(346,887)
Total stockholders' equity	(163,615)	(98,926)
Total liabilities and stockholders' equity	$ (561,553)	$ (445,813)