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Convertible Senior Notes - Narrative (Detail) - USD ($)			3 Months Ended		6 Months Ended
	Aug. 18, 2014	Mar. 17, 2014	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Debt Instrument [Line Items]
Convertible senior notes, carrying value			$ 249,069,000		$ 249,069,000		$ 248,173,000
Convertible Debt [Member]
Debt Instrument [Line Items]
Conversion rate basis, principal amount	$ 1,000,000
Convertible Debt [Member] | 2019 Notes [Member]
Debt Instrument [Line Items]
Conversion price (in dollars per share)			$ 17.74		$ 17.74
Equity component of the notes					$ 11,445,000
Interest expense on debt			$ 3,503,000	$ 3,503,000	7,006,000	$ 7,006,000
Additional non-cash interest expense			883,000	$ 855,000	1,759,000	$ 1,699,000
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			141,070,000		141,070,000
Unamortized discount			2,680,000		2,680,000
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			107,999,000		107,999,000
Unamortized discount			$ 3,001,000		$ 3,001,000

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