Condensed Consolidating Balance Sheet (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
ASSETS
Cash and cash equivalents	$ 41,069	$ 74,393
Restricted cash	1,641
Accounts receivable, net of allowance	229,541	248,588
Current deferred tax assets	8,884	13,229
Prepaid expenses and other current assets	41,347	29,775
Total current assets	322,482	365,985
Property and equipment, net	2,755,292	2,658,628
Restricted cash	114	2,858
Investment in direct financing lease	1,992	3,223
Goodwill	15,155	16,110
Non-current deferred tax assets	4,035	2,301
Other assets	76,096	78,086
Total assets	3,175,166	3,127,191
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	307,591	317,566
Income taxes payable	1,086	1,368
Current liabilities of discontinued operations		54
Total current liabilities	308,677	318,988
Long-term debt	1,238,000	1,200,000
Deferred revenue	82,976	87,227
Other liabilities	64,352	39,476
Total liabilities	1,694,005	1,645,691
Total stockholders' equity	1,481,161	1,481,500	$ 1,499,630	$ 1,502,507
Total liabilities and stockholders' equity	3,175,166	3,127,191
Parent
ASSETS
Cash and cash equivalents	1,556	12,337
Restricted cash	654
Accounts receivable, net of allowance	173,754	167,626
Current deferred tax assets	195
Prepaid expenses and other current assets	3,471	17,060
Total current assets	179,630	197,023
Property and equipment, net	2,505,428	2,459,053
Restricted cash	114	1,267
Investment in direct financing lease	1,992	3,223
Other assets	206,879	241,690
Total assets	2,894,043	2,902,256
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	173,326	218,403
Income taxes payable	77	195
Current deferred tax liabilities		13
Total current liabilities	173,403	218,611
Long-term debt	1,238,000	1,200,000
Non-current deferred tax liabilities	375	477
Other liabilities	1,104	1,668
Total liabilities	1,412,882	1,420,756
Total stockholders' equity	1,481,161	1,481,500
Total liabilities and stockholders' equity	2,894,043	2,902,256
Combined Subsidiary Guarantors
ASSETS
Cash and cash equivalents	39,513	62,056
Restricted cash	987
Accounts receivable, net of allowance	124,219	178,911
Current deferred tax assets	8,689	13,241
Prepaid expenses and other current assets	45,697	34,705
Total current assets	219,105	288,913
Property and equipment, net	249,864	199,575
Restricted cash		1,591
Goodwill	15,155	16,110
Non-current deferred tax assets	4,410	2,778
Other assets	45,342	47,046
Total assets	533,876	556,013
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	210,484	205,213
Income taxes payable	1,009	1,173
Note payable to an affiliate		13,854
Current liabilities of discontinued operations		54
Total current liabilities	211,493	220,294
Long-term debt	115,000	115,000
Deferred revenue	82,976	87,227
Other liabilities	63,248	37,808
Total liabilities	472,717	460,329
Total stockholders' equity	61,159	95,684
Total liabilities and stockholders' equity	533,876	556,013
Consolidating Adjustments and Other
ASSETS
Accounts receivable, net of allowance	(68,432)	(97,949)
Current deferred tax assets		(12)
Prepaid expenses and other current assets	(7,821)	(21,990)
Total current assets	(76,253)	(119,951)
Non-current deferred tax assets	(375)	(477)
Other assets	(176,125)	(210,650)
Total assets	(252,753)	(331,078)
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	(76,219)	(106,050)
Current deferred tax liabilities		(13)
Note payable to an affiliate		(13,854)
Total current liabilities	(76,219)	(119,917)
Long-term debt	(115,000)	(115,000)
Non-current deferred tax liabilities	(375)	(477)
Total liabilities	(191,594)	(235,394)
Total stockholders' equity	(61,159)	(95,684)
Total liabilities and stockholders' equity	$ (252,753)	$ (331,078)