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Convertible Senior Notes - Summary of 2019 Notes (Detail) - Convertible Debt [Member] | Aug. 18, 2014 USD ($) | Mar. 17, 2014 USD ($)
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March 2019 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Principal Amount |  | $ 143,750,000
Coupon Rate |  | 5.50%
Effective rate |  | 6.25%
Conversion rate |  | 55.3649
Remaining Period of Amortization |  | 3 years 5 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 | 55.3649 |
Remaining Period of Amortization | 3 years 5 months 15 days |

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