Derivative Instruments - Location and Fair Value of Foreign Currency Sales Contracts Recorded on Condensed Consolidated Balance Sheets (Detail) - Foreign Currency Sales Contracts [Member] - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Receivables [Member]
Derivative [Line Items]
Fair value hedged items	$ 258	$ 232
Other Current Assets [Member]
Derivative [Line Items]
Fair value hedge contracts	0	44
Fair value hedged items	392	967
Other Current Liabilities [Member]
Derivative [Line Items]
Fair value hedge contracts	486	950
Fair value hedged items	0	12
Other Noncurrent Liabilities [Member]
Derivative [Line Items]
Fair value hedge contracts	123	70
Other Noncurrent Assets [Member]
Derivative [Line Items]
Fair value hedged items	$ 387	$ 105