Fair Value Measurements and Financial Instruments - Additional Information (Detail) - Cash Flow Hedging [Member] $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Foreign Exchange Contract [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative, Notional Amount	$ 89,982
Derivative, Maturity Date	Jun. 30, 2019
Interest Rate Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative, Notional Amount	$ 150,000
Derivative, Maturity Date	Sep. 30, 2018