Condensed Consolidating Balance Sheet (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
ASSETS
Cash and cash equivalents	$ 46,584	$ 37,711	$ 70,843	$ 65,291
Accounts receivable, net of allowance	206,848	229,885
Prepaid expenses and other current assets	25,620	31,228
Total current assets	279,052	298,824
Property and equipment, net	2,806,078	2,837,657
Goodwill	40,402	38,386
Non-current deferred tax assets	11,537	13,735
Other assets	87,247	83,002
Total assets	3,224,316	3,271,604
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable and accrued expenses	243,975	260,107
Income taxes payable	853	2,086
Current portion of long-term debt	10,000	10,000
Total current liabilities	254,828	272,193
Long-term debt, net	1,407,196	1,435,169
Deferred revenue	46,574	53,437
Other liabilities	52,374	51,842
Total liabilities	1,760,972	1,812,641
Total stockholders’ equity	1,463,344	1,458,963	$ 1,444,627	$ 1,462,748
Total liabilities and stockholders’ equity	3,224,316	3,271,604
Reportable Legal Entities | Parent
ASSETS
Cash and cash equivalents	16,078	11,378
Accounts receivable, net of allowance	189,181	237,495
Prepaid expenses and other current assets	2,445	7,582
Total current assets	207,704	256,455
Property and equipment, net	2,477,862	2,493,025
Goodwill	25,506	23,231
Other assets	382,649	339,391
Total assets	3,093,721	3,112,102
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable and accrued expenses	209,271	203,074
Income taxes payable	1,370	1,850
Current portion of long-term debt	10,000	10,000
Total current liabilities	220,641	214,924
Long-term debt, net	1,408,102	1,436,186
Non-current deferred tax liabilities	559	321
Other liabilities	1,075	1,708
Total liabilities	1,630,377	1,653,139
Total stockholders’ equity	1,463,344	1,458,963
Total liabilities and stockholders’ equity	3,093,721	3,112,102
Reportable Legal Entities | Combined Subsidiary Guarantors
ASSETS
Cash and cash equivalents	30,506	26,333
Accounts receivable, net of allowance	309,411	270,952
Prepaid expenses and other current assets	29,385	30,123
Total current assets	369,302	327,408
Property and equipment, net	328,216	344,632
Goodwill	14,896	15,155
Non-current deferred tax assets	12,096	14,056
Other assets	64,038	57,873
Total assets	788,548	759,124
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable and accrued expenses	332,658	342,072
Income taxes payable	(517)	236
Total current liabilities	332,141	342,308
Long-term debt, net	114,094	113,983
Deferred revenue	46,574	53,437
Other liabilities	51,299	50,134
Total liabilities	544,108	559,862
Total stockholders’ equity	244,440	199,262
Total liabilities and stockholders’ equity	788,548	759,124
Consolidating Adjustments and Other
ASSETS
Accounts receivable, net of allowance	(291,744)	(278,562)
Prepaid expenses and other current assets	(6,210)	(6,477)
Total current assets	(297,954)	(285,039)
Non-current deferred tax assets	(559)	(321)
Other assets	(359,440)	(314,262)
Total assets	(657,953)	(599,622)
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable and accrued expenses	(297,954)	(285,039)
Total current liabilities	(297,954)	(285,039)
Long-term debt, net	(115,000)	(115,000)
Non-current deferred tax liabilities	(559)	(321)
Total liabilities	(413,513)	(400,360)
Total stockholders’ equity	(244,440)	(199,262)
Total liabilities and stockholders’ equity	$ (657,953)	$ (599,622)