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Convertible Senior Notes - Summary of 2019 Notes (Detail) - Convertible Debt [Member]	6 Months Ended
	Jun. 30, 2017 USD ($)	Aug. 18, 2014 USD ($)	Mar. 17, 2014 USD ($)
March 2019 Notes [Member]
Debt Instrument [Line Items]
Principal Amount	$ 143,750,000		$ 143,750,000
Coupon Rate	5.50%		5.50%
Effective rate	6.25%
Conversion rate	57.1177
Remaining Period of Amortization	1 year 8 months 16 days
August 2019 Notes [Member]
Debt Instrument [Line Items]
Principal Amount	$ 111,000,000	$ 111,000,000
Coupon Rate	5.50%	5.50%
Effective rate	6.50%
Conversion rate	57.1177
Remaining Period of Amortization	1 year 8 months 16 days

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