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Convertible Senior Notes - Narrative (Detail) - USD ($)			3 Months Ended	9 Months Ended
	Aug. 18, 2014	Mar. 17, 2014	Sep. 30, 2015	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Debt Instrument [Line Items]
Proceeds from issuance of convertible senior notes				$ 0	$ 256,970,000
Convertible senior notes, carrying value			$ 247,736,000	$ 247,736,000		$ 246,464,000
Convertible Debt [Member] | 2019 Notes [Member]
Debt Instrument [Line Items]
Conversion price (in dollars per share)			$ 18.06	$ 18.06
Equity component of the notes				$ 11,445,000
Interest expense on debt			$ 3,503,000	10,508,000
Additional non-cash interest expense			867,000	2,566,000
Convertible Debt [Member] | March 2019 Notes [Member]
Debt Instrument [Line Items]
Principal Amount		$ 143,750,000
Coupon Rate		5.50%
Proceeds from issuance of convertible senior notes		$ 139,037,000
Convertible senior notes, carrying value			140,405,000	140,405,000
Unamortized discount			3,345,000	3,345,000
Convertible Debt [Member] | August 2019 Notes [Member]
Debt Instrument [Line Items]
Principal Amount	$ 111,000,000
Coupon Rate	5.50%
Proceeds from issuance of convertible senior notes	$ 109,615,000
Convertible senior notes, carrying value			107,331,000	107,331,000
Unamortized discount			$ 3,669,000	$ 3,669,000

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