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Foreign Exchange Hedging Facility - Additional Information (Detail) (USD $)
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12 Months Ended | |||
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Dec. 31, 2012
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 09, 2011
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Obligations under restricted cash | $ 0 | $ 0 | ||
| Foreign Exchange Forward [Member] | ||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Obligations under restricted cash | 1,000,000 | |||
| Loss on hedging transactions | $ 48,000 | |||
| Termination date of facility | 2013-02 |