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	Sep. 30, 2019	Dec. 31, 2018
Receivables [Member]
Derivative [Line Items]
Fair value hedged items	$ 459	$ 232
Other Current Assets [Member]
Derivative [Line Items]
Fair value hedge contracts	0	44
Fair value hedged items	782	967
Other Current Liabilities [Member]
Derivative [Line Items]
Fair value hedge contracts	1,103	950
Fair value hedged items	0	12
Other Noncurrent Liabilities [Member]
Derivative [Line Items]
Fair value hedge contracts	434	70
Other Noncurrent Assets [Member]
Derivative [Line Items]
Fair value hedged items	$ 578	$ 105