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Schedule of Summary by Currency of Foreign Currency Forward Contracts (Detail) - Foreign currency forward contracts - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
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Buy |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Contractual amounts of foreign currency forward contracts | $ 45,600,000 | $ 42,300,000
Buy | Euro |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Contractual amounts of foreign currency forward contracts | 29,300,000 | 25,400,000
Buy | Mexican peso |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Contractual amounts of foreign currency forward contracts | 16,300,000 | 16,900,000
Sell |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Contractual amounts of foreign currency forward contracts | 49,300,000 | 59,900,000
Sell | British pound |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Contractual amounts of foreign currency forward contracts | 1,200,000 | 1,200,000
Sell | Canadian dollar |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Contractual amounts of foreign currency forward contracts | $ 48,100,000 | 56,900,000
Sell | Euro |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Contractual amounts of foreign currency forward contracts |  | $ 1,800,000

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