Information Concerning Guarantor and Non-Guarantor Subsidiaries - Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) continuing operating activities	$ 64,206	$ 129,266
Net cash provided by discontinued operating activities	94	47
Net cash provided by (used in) operating activities	64,300	129,313
Purchases of property and equipment	(23,584)	(78,189)
Collection of notes receivable	1,740	4,480
Increase in restricted cash and cash equivalents	(12,347)
Other investing activities	227	851
Net cash provided by (used in) investing activities - continuing operations	(33,964)	(72,858)
Net cash used in investing activities - discontinued operations
Net cash provided by (used in) investing activities	(33,964)	(72,858)
Net borrowings under credit facility	(12,000)	65,000
Issuance of senior notes	350,000
Early redemption of senior notes	(152,180)
Repurchase and conversion of convertible notes	(99,222)
Deferred financing costs paid	(15,516)	(376)
Proceeds from issuance of common stock		32,722
Repurchase of Company stock for retirement	(100,028)	(185,400)
Payment of dividend	(51,162)
Proceeds from exercise of stock option and purchase plans	5,206	12,005
Excess tax benefit from stock-based compensation	7
Other financing activities, net	(521)	(564)
Net cash provided by (used in) financing activities - continuing operations	(75,416)	(76,613)
Net cash used in financing activities - discontinued operations
Net cash provided by (used in) financing activities	(75,416)	(76,613)
Net change in cash and cash equivalents	(45,080)	(20,158)
Cash and cash equivalents at beginning of period	97,170	44,388
Cash and cash equivalents at end of period	52,090	24,230
Parent Guarantor [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) continuing operating activities	397,379	62,976
Net cash provided by discontinued operating activities
Net cash provided by (used in) operating activities	397,379	62,976
Purchases of property and equipment		(6,648)
Collection of notes receivable
Increase in restricted cash and cash equivalents
Other investing activities
Net cash provided by (used in) investing activities - continuing operations		(6,648)
Net cash used in investing activities - discontinued operations
Net cash provided by (used in) investing activities		(6,648)
Net borrowings under credit facility		65,000
Issuance of senior notes
Early redemption of senior notes	(152,180)
Repurchase and conversion of convertible notes	(99,222)
Deferred financing costs paid		(376)
Proceeds from issuance of common stock		32,722
Repurchase of Company stock for retirement	(100,028)	(185,400)
Payment of dividend	(51,162)
Proceeds from exercise of stock option and purchase plans	5,206	12,005
Excess tax benefit from stock-based compensation	7
Other financing activities, net
Net cash provided by (used in) financing activities - continuing operations	(397,379)	(76,049)
Net cash used in financing activities - discontinued operations
Net cash provided by (used in) financing activities	(397,379)	(76,049)
Net change in cash and cash equivalents		(19,721)
Cash and cash equivalents at beginning of period		37,562
Cash and cash equivalents at end of period		17,841
Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) continuing operating activities	(322,427)
Net cash provided by discontinued operating activities
Net cash provided by (used in) operating activities	(322,427)
Purchases of property and equipment
Collection of notes receivable
Increase in restricted cash and cash equivalents
Other investing activities
Net cash provided by (used in) investing activities - continuing operations
Net cash used in investing activities - discontinued operations
Net cash provided by (used in) investing activities
Net borrowings under credit facility	(12,000)
Issuance of senior notes	350,000
Early redemption of senior notes
Repurchase and conversion of convertible notes
Deferred financing costs paid	(15,516)
Proceeds from issuance of common stock
Repurchase of Company stock for retirement
Payment of dividend
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	322,484
Net cash used in financing activities - discontinued operations
Net cash provided by (used in) financing activities	322,484
Net change in cash and cash equivalents	57
Cash and cash equivalents at beginning of period
Cash and cash equivalents at end of period	57
Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) continuing operating activities	37
Net cash provided by discontinued operating activities
Net cash provided by (used in) operating activities	37
Purchases of property and equipment	558
Collection of notes receivable
Increase in restricted cash and cash equivalents
Other investing activities
Net cash provided by (used in) investing activities - continuing operations	558
Net cash used in investing activities - discontinued operations
Net cash provided by (used in) investing activities	558
Net borrowings under credit facility
Issuance of senior notes
Early redemption of senior notes
Repurchase and conversion of convertible notes
Deferred financing costs paid
Proceeds from issuance of common stock
Repurchase of Company stock for retirement
Payment of dividend
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 at beginning of period	(595)
Cash and cash equivalents at end of period
Non-Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) continuing operating activities	(10,783)	66,290
Net cash provided by discontinued operating activities	94	47
Net cash provided by (used in) operating activities	(10,689)	66,337
Purchases of property and equipment	(24,142)	(71,541)
Collection of notes receivable	1,740	4,480
Increase in restricted cash and cash equivalents	(12,347)
Other investing activities	227	851
Net cash provided by (used in) investing activities - continuing operations	(34,522)	(66,210)
Net cash used in investing activities - discontinued operations
Net cash provided by (used in) investing activities	(34,522)	(66,210)
Net borrowings under credit facility
Issuance of senior notes
Early redemption of senior notes
Repurchase and conversion of convertible notes
Deferred financing costs paid
Proceeds from issuance of common stock
Repurchase of Company stock for retirement
Payment of dividend
Proceeds from exercise of stock option and purchase plans
Excess tax benefit from stock-based compensation
Other financing activities, net	(521)	(564)
Net cash provided by (used in) financing activities - continuing operations	(521)	(564)
Net cash used in financing activities - discontinued operations
Net cash provided by (used in) financing activities	(521)	(564)
Net change in cash and cash equivalents	(45,732)	(437)
Cash and cash equivalents at beginning of period	97,765	6,826
Cash and cash equivalents at end of period	52,033	6,389
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) continuing operating activities
Net cash provided by discontinued operating activities
Net cash provided by (used in) operating activities
Purchases of property and equipment
Collection of notes receivable
Increase in restricted cash and cash equivalents
Other investing activities
Net cash provided by (used in) investing activities - continuing operations
Net cash used in investing activities - discontinued operations
Net cash provided by (used in) investing activities
Net borrowings under credit facility
Issuance of senior notes
Early redemption of senior notes
Repurchase and conversion of convertible notes
Deferred financing costs paid
Proceeds from issuance of common stock
Repurchase of Company stock for retirement
Payment of dividend
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 at beginning of period
Cash and cash equivalents at end of period