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Changes in Fair Value of Foreign Currency Forward Contracts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivative instruments | $ (1,641) | $ 1,682 | $ 0
Unrealized (loss) gain on foreign currency forward contracts | Other income (expense), net |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivative instruments | (1,641) | 1,682 | (41)
Realized loss on foreign currency forward contracts | Other income (expense), net |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivative instruments | $ 2,129 | $ (562) | $ (629)

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