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Convertible Senior Notes - Summary of 2019 Notes (Detail) - Convertible Debt [Member]	Aug. 18, 2014 USD ($)	Mar. 17, 2014 USD ($)
March 2019 Notes [Member]
Debt Instrument [Line Items]
Principal Amount		$ 143,750,000
Coupon Rate		5.50%
Effective rate		6.25%
Conversion rate		56.36
Remaining Period of Amortization		2 years 8 months 15 days
August 2019 Notes [Member]
Debt Instrument [Line Items]
Principal Amount	$ 111,000,000
Coupon Rate	5.50%
Effective rate	6.50%
Conversion rate	56.36
Remaining Period of Amortization	2 years 8 months 15 days

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