Information Concerning Guarantor and Non-Guarantor Subsidiaries - Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) continuing operating activities	$ 30,061	$ (46,911)
Net cash provided by (used in) discontinued operating activities	(230)	49
Net cash provided by (used in) operating activities	29,831	(46,862)
Purchases of property and equipment	(17,484)	(10,139)
Other investing activities		9
(Increase) decrease in restricted cash and cash equivalents	9,509	(724)
Net cash used in investing activities - continuing operations	(7,975)	(10,854)
Net cash used in investing activities - discontinued operations
Net cash used in investing activities	(7,975)	(10,854)
Net borrowings (repayments) under credit facility	(3,500)	209,000
Early redemption of senior notes		(152,180)
Payment of dividend	(25,459)
Deferred financing costs paid		(22)
Repurchase of Company stock for retirement		(55,676)
Proceeds from exercise of stock option and purchase plans	1,078	4,255
Excess tax benefit from stock-based compensation	10	212
Other financing activities, net	(147)	(195)
Net cash provided by (used in) financing activities - continuing operations	(28,018)	5,394
Net cash used in financing activities - discontinued operations
Net cash provided by (used in) financing activities	(28,018)	5,394
Net change in cash and cash equivalents	(6,162)	(52,322)
Cash and cash equivalents - unrestricted, beginning of period	61,579	97,170
Cash and cash equivalents - unrestricted, end of period	55,417	44,848
Parent Guarantor [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) continuing operating activities	24,395	203,389
Net cash provided by (used in) discontinued operating activities
Net cash provided by (used in) operating activities	24,395	203,389
Purchases of property and equipment	(24)
Other investing activities
(Increase) decrease in restricted cash and cash equivalents
Net cash used in investing activities - continuing operations	(24)
Net cash used in investing activities - discontinued operations
Net cash used in investing activities	(24)
Net borrowings (repayments) under credit facility
Early redemption of senior notes		(152,180)
Payment of dividend	(25,459)
Deferred financing costs paid
Repurchase of Company stock for retirement		(55,676)
Proceeds from exercise of stock option and purchase plans	1,078	4,255
Excess tax benefit from stock-based compensation	10	212
Other financing activities, net
Net cash provided by (used in) financing activities - continuing operations	(24,371)	(203,389)
Net cash used in financing activities - discontinued operations
Net cash provided by (used in) financing activities	(24,371)	(203,389)
Net change in cash and cash equivalents
Cash and cash equivalents - unrestricted, beginning of period
Cash and cash equivalents - unrestricted, end of period
Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) continuing operating activities	8,930	(208,562)
Net cash provided by (used in) discontinued operating activities
Net cash provided by (used in) operating activities	8,930	(208,562)
Purchases of property and equipment
Other investing activities
(Increase) decrease in restricted cash and cash equivalents
Net cash used in investing activities - continuing operations
Net cash used in investing activities - discontinued operations
Net cash used in investing activities
Net borrowings (repayments) under credit facility	(3,500)	209,000
Early redemption of senior notes
Payment of dividend
Deferred financing costs paid		(22)
Repurchase of Company stock for retirement
Proceeds from exercise of stock option and purchase plans
Excess tax benefit from stock-based compensation
Other financing activities, net
Net cash provided by (used in) financing activities - continuing operations	(3,500)	208,978
Net cash used in financing activities - discontinued operations
Net cash provided by (used in) financing activities	(3,500)	208,978
Net change in cash and cash equivalents	5,430	416
Cash and cash equivalents - unrestricted, beginning of period	714
Cash and cash equivalents - unrestricted, end of period	6,144	416
Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) continuing operating activities	3	1,142
Net cash provided by (used in) discontinued operating activities
Net cash provided by (used in) operating activities	3	1,142
Purchases of property and equipment	(3)	(547)
Other investing activities
(Increase) decrease in restricted cash and cash equivalents
Net cash used in investing activities - continuing operations	(3)	(547)
Net cash used in investing activities - discontinued operations
Net cash used in investing activities	(3)	(547)
Net borrowings (repayments) under credit facility
Early redemption of senior notes
Payment of dividend
Deferred financing costs paid
Repurchase of Company stock for retirement
Proceeds from exercise of stock option and purchase plans
Excess tax benefit from stock-based compensation
Other financing activities, net
Net cash provided by (used in) financing activities - continuing operations
Net cash used in financing activities - discontinued operations
Net cash provided by (used in) financing activities
Net change in cash and cash equivalents		595
Cash and cash equivalents - unrestricted, beginning of period		(595)
Cash and cash equivalents - unrestricted, end of period
Non-Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) continuing operating activities	(3,267)	(42,880)
Net cash provided by (used in) discontinued operating activities	(230)	49
Net cash provided by (used in) operating activities	(3,497)	(42,831)
Purchases of property and equipment	(17,457)	(9,592)
Other investing activities		9
(Increase) decrease in restricted cash and cash equivalents	9,509	(724)
Net cash used in investing activities - continuing operations	(7,948)	(10,307)
Net cash used in investing activities - discontinued operations
Net cash used in investing activities	(7,948)	(10,307)
Net borrowings (repayments) under credit facility
Early redemption of senior notes
Payment of dividend
Deferred financing costs paid
Repurchase of Company stock for retirement
Proceeds from exercise of stock option and purchase plans
Excess tax benefit from stock-based compensation
Other financing activities, net	(147)	(195)
Net cash provided by (used in) financing activities - continuing operations	(147)	(195)
Net cash used in financing activities - discontinued operations
Net cash provided by (used in) financing activities	(147)	(195)
Net change in cash and cash equivalents	(11,592)	(53,333)
Cash and cash equivalents - unrestricted, beginning of period	60,865	97,765
Cash and cash equivalents - unrestricted, end of period	49,273	44,432
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) continuing operating activities
Net cash provided by (used in) discontinued operating activities
Net cash provided by (used in) operating activities
Purchases of property and equipment
Other investing activities
(Increase) decrease in restricted cash and cash equivalents
Net cash used in investing activities - continuing operations
Net cash used in investing activities - discontinued operations
Net cash used in investing activities
Net borrowings (repayments) under credit facility
Early redemption of senior notes
Payment of dividend
Deferred financing costs paid
Repurchase of Company stock for retirement
Proceeds from exercise of stock option and purchase plans
Excess tax benefit from stock-based compensation
Other financing activities, net
Net cash provided by (used in) financing activities - continuing operations
Net cash used in financing activities - discontinued operations
Net cash provided by (used in) financing activities
Net change in cash and cash equivalents
Cash and cash equivalents - unrestricted, beginning of period
Cash and cash equivalents - unrestricted, end of period