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	Mar. 31, 2017	Dec. 31, 2016
Receivables [Member]
Derivative [Line Items]
Fair value hedged items	$ 48	$ 121
Other Current Assets [Member]
Derivative [Line Items]
Fair value hedge contracts	206	214
Fair value hedged items	269	808
Other Noncurrent Assets [Member]
Derivative [Line Items]
Fair value hedge contracts	0	2
Fair value hedged items	3	45
Other Current Liabilities [Member]
Derivative [Line Items]
Fair value hedge contracts	293	940
Fair value hedged items	173	233
Other Noncurrent Liabilities [Member]
Derivative [Line Items]
Fair value hedge contracts	2	35
Fair value hedged items	$ 0	$ 5