Foreign Exchange Hedging Facility - Additional Information (Detail) - Foreign Exchange Forward [Member] - Cash Flow Hedging [Member] |
12 Months Ended |
|---|---|
|
Dec. 31, 2016
USD ($)
ForwardContract
| |
| Derivative Instruments, Gain (Loss) [Line Items] | |
| Cash flow hedging losses on forward contracts | $ | $ 325,000 |
| Number of contracts outstanding | ForwardContract | 0 |