Condensed Consolidating Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 46,615	$ 77,909
Accounts receivable, net of allowance	246,894	244,957
Current deferred tax assets	6,351	9,241
Prepaid expenses and other current assets	29,007	20,612
Current assets of discontinued operations		15
Total current assets	328,867	352,734
Property and equipment, net	2,538,996	2,546,613
Restricted cash	2,607	5,589
Investment in direct financing lease	4,382	5,473
Goodwill	16,110	16,110
Non-current deferred tax assets	5,875	3,078
Other assets	76,657	77,828
Total assets	2,973,494	3,007,425
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	237,438	252,277
Income taxes payable	676	1,243
Current liabilities of discontinued operations	370	886
Total current liabilities	238,484	254,406
Long-term debt	1,195,000	1,205,000
Other liabilities	40,380	45,512
Total liabilities	1,473,864	1,504,918
Total stockholders' equity	1,499,630	1,502,507	1,501,189	1,521,620
Total liabilities and stockholders' equity	2,973,494	3,007,425
Parent
ASSETS
Cash and cash equivalents	15,293	31,647
Accounts receivable, net of allowance	211,830	203,018
Current deferred tax assets	4	2
Prepaid expenses and other current assets	4,330	7,580
Total current assets	231,457	242,247
Property and equipment, net	2,451,128	2,450,028
Restricted cash	1,016	1,016
Investment in direct financing lease	4,382	5,473
Other assets	254,542	245,028
Total assets	2,942,525	2,943,792
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	245,998	234,277
Income taxes payable	32
Total current liabilities	246,030	234,277
Long-term debt	1,195,000	1,205,000
Deferred tax liabilities	559	555
Other liabilities	1,306	1,453
Total liabilities	1,442,895	1,441,285
Total stockholders' equity	1,499,630	1,502,507
Total liabilities and stockholders' equity	2,942,525	2,943,792
Combined Subsidiary Guarantors
ASSETS
Cash and cash equivalents	31,322	46,262
Accounts receivable, net of allowance	183,369	178,894
Current deferred tax assets	6,347	9,239
Prepaid expenses and other current assets	34,292	22,856
Current assets of discontinued operations		15
Total current assets	255,330	257,266
Property and equipment, net	87,868	96,585
Restricted cash	1,591	4,573
Goodwill	16,110	16,110
Non-current deferred tax assets	6,434	3,633
Other assets	47,474	45,149
Total assets	414,807	423,316
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	149,325	164,745
Income taxes payable	644	1,243
Current liabilities of discontinued operations	370	886
Total current liabilities	150,339	166,874
Long-term debt	115,000	115,000
Other liabilities	39,074	44,059
Total liabilities	304,413	325,933
Total stockholders' equity	110,394	97,383
Total liabilities and stockholders' equity	414,807	423,316
Consolidating Adjustments and Other
ASSETS
Accounts receivable, net of allowance	(148,305)	(136,955)
Prepaid expenses and other current assets	(9,615)	(9,824)
Total current assets	(157,920)	(146,779)
Non-current deferred tax assets	(559)	(555)
Other assets	(225,359)	(212,349)
Total assets	(383,838)	(359,683)
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	(157,885)	(146,745)
Total current liabilities	(157,885)	(146,745)
Long-term debt	(115,000)	(115,000)
Deferred tax liabilities	(559)	(555)
Total liabilities	(273,444)	(262,300)
Total stockholders' equity	(110,394)	(97,383)
Total liabilities and stockholders' equity	$ (383,838)	$ (359,683)