Condensed Consolidating Balance Sheet (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
ASSETS
Cash and cash equivalents	$ 43,164	$ 37,711
Accounts receivable, net of allowance	213,027	229,885
Prepaid expenses and other current assets	25,391	31,228
Total current assets	281,582	298,824
Property and equipment, net	2,822,805	2,837,657
Goodwill	38,127	38,386
Non-current deferred tax assets	11,868	13,735
Other assets	86,236	83,002
Total assets	3,240,618	3,271,604
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	240,586	260,107
Income taxes payable	2,601	2,086
Current portion of long-term debt	10,000	10,000
Total current liabilities	253,187	272,193
Long-term debt, net	1,421,182	1,435,169
Deferred revenue	50,006	53,437
Other liabilities	53,082	51,842
Total liabilities	1,777,457	1,812,641
Total stockholders' equity	1,463,161	1,458,963	$ 1,446,456	$ 1,462,748
Total liabilities and stockholders' equity	3,240,618	3,271,604
Parent
ASSETS
Cash and cash equivalents	16,482	11,378
Accounts receivable, net of allowance	218,412	237,495
Prepaid expenses and other current assets	2,890	7,582
Total current assets	237,784	256,455
Property and equipment, net	2,487,309	2,493,025
Goodwill	23,231	23,231
Other assets	358,111	339,391
Total assets	3,106,435	3,112,102
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	207,007	203,074
Income taxes payable	2,826	1,850
Current portion of long-term debt	10,000	10,000
Total current liabilities	219,833	214,924
Long-term debt, net	1,422,144	1,436,186
Non-current deferred tax liabilities	497	321
Other liabilities	800	1,708
Total liabilities	1,643,274	1,653,139
Total stockholders' equity	1,463,161	1,458,963
Total liabilities and stockholders' equity	3,106,435	3,112,102
Combined Subsidiary Guarantors
ASSETS
Cash and cash equivalents	26,682	26,333
Accounts receivable, net of allowance	279,745	270,952
Prepaid expenses and other current assets	28,606	30,123
Total current assets	335,033	327,408
Property and equipment, net	335,496	344,632
Goodwill	14,896	15,155
Non-current deferred tax assets	12,365	14,056
Other assets	62,692	57,873
Total assets	760,482	759,124
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	324,814	342,072
Income taxes payable	(225)	236
Total current liabilities	324,589	342,308
Long-term debt, net	114,038	113,983
Deferred revenue	50,006	53,437
Other liabilities	52,282	50,134
Total liabilities	540,915	559,862
Total stockholders' equity	219,567	199,262
Total liabilities and stockholders' equity	760,482	759,124
Consolidating Adjustments and Other
ASSETS
Accounts receivable, net of allowance	(285,130)	(278,562)
Prepaid expenses and other current assets	(6,105)	(6,477)
Total current assets	(291,235)	(285,039)
Non-current deferred tax assets	(497)	(321)
Other assets	(334,567)	(314,262)
Total assets	(626,299)	(599,622)
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	(291,235)	(285,039)
Total current liabilities	(291,235)	(285,039)
Long-term debt, net	(115,000)	(115,000)
Non-current deferred tax liabilities	(497)	(321)
Total liabilities	(406,732)	(400,360)
Total stockholders' equity	(219,567)	(199,262)
Total liabilities and stockholders' equity	$ (626,299)	$ (599,622)