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Derivative Instruments - Additional Information (Detail) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |
Derivative notional amount | $ 52,718,000 | $ 41,197,000
Minimum [Member] |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |
Derivative foreign currency exchange contracts durations | 1 month |
Maximum [Member] |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |
Derivative foreign currency exchange contracts durations | 3 months |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Derivative foreign currency exchange contracts durations. + References No definition available. + Details
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