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Convertible Senior Notes - Narrative (Detail) - USD ($)			3 Months Ended
	Aug. 18, 2014	Mar. 17, 2014	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Debt Instrument [Line Items]
Convertible senior notes, carrying value			$ 248,617,000		$ 248,173,000
Convertible Debt [Member] | 2019 Notes [Member]
Debt Instrument [Line Items]
Conversion price (in dollars per share)			$ 18.06
Equity component of the notes			$ 11,445,000
Interest expense on debt			3,503,000	$ 3,503,000
Additional non-cash interest expense			876,000	$ 844,000
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			140,845,000
Unamortized discount			2,905,000
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			107,772,000
Unamortized discount			$ 3,228,000

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