Condensed Consolidating Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 52,681	$ 77,909
Accounts receivable, net of allowance	239,300	244,957
Current deferred tax assets	7,809	9,241
Prepaid expenses and other current assets	18,720	20,612
Current assets of discontinued operations	6	15
Total current assets	318,516	352,734
Property and equipment, net	2,543,470	2,546,613
Restricted cash	5,590	5,589
Investment in direct financing lease	4,936	5,473
Goodwill	16,110	16,110
Non-current deferred tax assets	5,505	3,078
Other assets	75,131	77,828
Total assets	2,969,258	3,007,425
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	227,041	252,277
Income taxes payable	1,859	1,243
Current liabilities of discontinued operations	388	886
Total current liabilities	229,288	254,406
Long-term debt	1,195,000	1,205,000
Other liabilities	45,954	45,512
Total liabilities	1,470,242	1,504,918
Total stockholders' equity	1,499,016	1,502,507	1,661,902	1,521,620
Total liabilities and stockholders' equity	2,969,258	3,007,425
Parent
ASSETS
Cash and cash equivalents	28,205	31,647
Accounts receivable, net of allowance	201,463	203,018
Current deferred tax assets	3	2
Prepaid expenses and other current assets	4,127	7,580
Total current assets	233,798	242,247
Property and equipment, net	2,453,401	2,450,028
Restricted cash	1,016	1,016
Investment in direct financing lease	4,936	5,473
Other assets	245,288	245,028
Total assets	2,938,439	2,943,792
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	242,846	234,277
Income taxes payable	3
Total current liabilities	242,849	234,277
Long-term debt	1,195,000	1,205,000
Deferred tax liabilities	564	555
Other liabilities	1,010	1,453
Total liabilities	1,439,423	1,441,285
Total stockholders' equity	1,499,016	1,502,507
Total liabilities and stockholders' equity	2,938,439	2,943,792
Combined Subsidiary Guarantors
ASSETS
Cash and cash equivalents	24,476	46,262
Accounts receivable, net of allowance	183,833	178,894
Current deferred tax assets	7,806	9,239
Prepaid expenses and other current assets	24,114	22,856
Current assets of discontinued operations	6	15
Total current assets	240,235	257,266
Property and equipment, net	90,069	96,585
Restricted cash	4,574	4,573
Goodwill	16,110	16,110
Non-current deferred tax assets	6,069	3,633
Other assets	45,584	45,149
Total assets	402,641	423,316
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	139,677	164,745
Income taxes payable	1,856	1,243
Current liabilities of discontinued operations	388	886
Total current liabilities	141,921	166,874
Long-term debt	115,000	115,000
Other liabilities	44,944	44,059
Total liabilities	301,865	325,933
Total stockholders' equity	100,776	97,383
Total liabilities and stockholders' equity	402,641	423,316
Consolidating Adjustments and Other
ASSETS
Accounts receivable, net of allowance	(145,996)	(136,955)
Prepaid expenses and other current assets	(9,521)	(9,824)
Total current assets	(155,517)	(146,779)
Non-current deferred tax assets	(564)	(555)
Other assets	(215,741)	(212,349)
Total assets	(371,822)	(359,683)
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	(155,482)	(146,745)
Total current liabilities	(155,482)	(146,745)
Long-term debt	(115,000)	(115,000)
Deferred tax liabilities	(564)	(555)
Total liabilities	(271,046)	(262,300)
Total stockholders' equity	(100,776)	(97,383)
Total liabilities and stockholders' equity	$ (371,822)	$ (359,683)