Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Gain (loss) of the effective portion of change in fair value of foreign currency forward contracts	$ (1,821)	$ 713
Long-term debt and finance leases	120,624	121,284
Quoted Prices in Active Markets for Identical Assets Level (1)
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Fair value of long term debt	140,142	137,343
Foreign Currency Derivative
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Notional amount of the foreign currency derivative instruments	$ 181,319	$ 129,542
Foreign Currency Derivative | Maximum
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Maturity period of hedges	12 months
Derivatives Designated as Cash Flow Hedges
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Maturity period of hedges	3 years