Other Current Liabilities - Schedule of Change in Customer Deposits (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Contract With Customer Liability [Abstract]
Balance at beginning of the period	$ 3,031	$ 4,702	$ 4,304	$ 4,574
Satisfaction of performance obligations	(1,071)	(2,637)	(5,005)	(5,149)
Receipt of additional deposits	1,971	2,876	4,709	5,513
Other, primarily changes in foreign currency exchange rates	83	(52)	6	(49)
Balance at end of the period	$ 4,014	$ 4,889	$ 4,014	$ 4,889