Information Concerning Guarantor and Non-Guarantor Subsidiaries - Condensed Consolidating Statement of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) continuing operating activities	$ 91,914	$ (8,987)
Net cash provided by (used in) discontinued operating activities	(205)	79
Net cash provided by (used in) operating activities	91,709	(8,908)
Purchases of property and equipment	(35,773)	(15,181)
Increase in restricted cash and cash equivalents	6,268	(8,273)
Other investing activities	398	226
Net cash used in investing activities - continuing operations	(29,107)	(23,228)
Net cash used in investing activities - discontinued operations
Net cash used in investing activities	(29,107)	(23,228)
Net borrowings (repayments) under credit facility	190,500	(82,000)
Issuance of senior notes		350,000
Repurchase and conversion of convertible notes	(126,541)
Early redemption of senior notes		(152,180)
Repurchase of common stock warrants	(50,775)
Deferred financing costs paid	(8,158)	(15,395)
Repurchase of Company stock for retirement		(100,028)
Payment of dividend	(53,389)	(25,823)
Proceeds from exercise of stock option and purchase plans	2,309	5,145
Excess tax benefit from stock-based compensation	12	4
Other financing activities, net	(296)	(357)
Net cash provided by (used in) financing activities - continuing operations	(46,338)	(20,634)
Net cash used in financing activities - discontinued operations
Net cash provided by (used in) financing activities	(46,338)	(20,634)
Net change in cash and cash equivalents	16,264	(52,770)
Cash and cash equivalents - unrestricted, beginning of period	61,579	97,170
Cash and cash equivalents - unrestricted, end of period	77,843	44,400
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
Increase in restricted cash and cash equivalents
Other investing activities
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
Issuance of senior notes
Repurchase and conversion of convertible notes
Early redemption of senior notes
Repurchase of common stock warrants
Deferred financing costs paid
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	0
Net change in cash and cash equivalents
Cash and cash equivalents - unrestricted, beginning of period
Cash and cash equivalents - unrestricted, end of period
Parent Guarantor [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) continuing operating activities	235,131	272,882
Net cash provided by (used in) discontinued operating activities
Net cash provided by (used in) operating activities	235,131	272,882
Purchases of property and equipment	(6,649)
Increase in restricted cash and cash equivalents
Other investing activities
Net cash used in investing activities - continuing operations	(6,649)
Net cash used in investing activities - discontinued operations
Net cash used in investing activities	(6,649)
Net borrowings (repayments) under credit facility
Issuance of senior notes
Repurchase and conversion of convertible notes	(126,541)
Early redemption of senior notes		(152,180)
Repurchase of common stock warrants	(50,775)
Deferred financing costs paid
Repurchase of Company stock for retirement		(100,028)
Payment of dividend	(53,389)	(25,823)
Proceeds from exercise of stock option and purchase plans	2,309	5,145
Excess tax benefit from stock-based compensation	12	4
Other financing activities, net
Net cash provided by (used in) financing activities - continuing operations	(228,384)	(272,882)
Net cash used in financing activities - discontinued operations
Net cash provided by (used in) financing activities	(228,384)	(272,882)
Net change in cash and cash equivalents	98
Cash and cash equivalents - unrestricted, beginning of period
Cash and cash equivalents - unrestricted, end of period	98
Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) continuing operating activities	(174,452)	(251,957)
Net cash provided by (used in) discontinued operating activities
Net cash provided by (used in) operating activities	(174,452)	(251,957)
Purchases of property and equipment
Increase in restricted cash and cash equivalents
Other investing activities
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	190,500	(82,000)
Issuance of senior notes		350,000
Repurchase and conversion of convertible notes
Early redemption of senior notes
Repurchase of common stock warrants
Deferred financing costs paid	(8,158)	(15,395)
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	182,342	252,605
Net cash used in financing activities - discontinued operations
Net cash provided by (used in) financing activities	182,342	252,605
Net change in cash and cash equivalents	7,890	648
Cash and cash equivalents - unrestricted, beginning of period	714
Cash and cash equivalents - unrestricted, end of period	8,604	648
Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) continuing operating activities	35	1,316
Net cash provided by (used in) discontinued operating activities
Net cash provided by (used in) operating activities	35	1,316
Purchases of property and equipment	(7)	(721)
Increase in restricted cash and cash equivalents
Other investing activities
Net cash used in investing activities - continuing operations	(7)	(721)
Net cash used in investing activities - discontinued operations
Net cash used in investing activities	(7)	(721)
Net borrowings (repayments) under credit facility
Issuance of senior notes
Repurchase and conversion of convertible notes
Early redemption of senior notes
Repurchase of common stock warrants
Deferred financing costs paid
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	28	595
Cash and cash equivalents - unrestricted, beginning of period		(595)
Cash and cash equivalents - unrestricted, end of period	28
Non-Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by (used in) continuing operating activities	31,200	(31,228)
Net cash provided by (used in) discontinued operating activities	(205)	79
Net cash provided by (used in) operating activities	30,995	(31,149)
Purchases of property and equipment	(29,117)	(14,460)
Increase in restricted cash and cash equivalents	6,268	(8,273)
Other investing activities	398	226
Net cash used in investing activities - continuing operations	(22,451)	(22,507)
Net cash used in investing activities - discontinued operations
Net cash used in investing activities	(22,451)	(22,507)
Net borrowings (repayments) under credit facility
Issuance of senior notes
Repurchase and conversion of convertible notes
Early redemption of senior notes
Repurchase of common stock warrants
Deferred financing costs paid
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	(296)	(357)
Net cash provided by (used in) financing activities - continuing operations	(296)	(357)
Net cash used in financing activities - discontinued operations
Net cash provided by (used in) financing activities	(296)	(357)
Net change in cash and cash equivalents	8,248	(54,013)
Cash and cash equivalents - unrestricted, beginning of period	60,865	97,765
Cash and cash equivalents - unrestricted, end of period	$ 69,113	$ 43,752