Derivative Instruments - Location and Fair Value of Foreign Currency Sales Contracts Recorded on Consolidated Balance Sheets (Detail) (Foreign Currency Sales Contracts [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Other Current Assets [Member]
Derivative [Line Items]
Fair value hedge contracts	$ 251	$ 426
Fair value hedged item	246	0
Other Noncurrent Assets [Member]
Derivative [Line Items]
Fair value hedge contracts	9	17
Fair value hedged item	19	0
Other Current Liabilities [Member]
Derivative [Line Items]
Fair value hedge contracts	291	0
Fair value hedged item	200	488
Cash flow hedge contracts	13	0
Other Noncurrent Liabilities [Member]
Derivative [Line Items]
Fair value hedge contracts	21	0
Fair value hedged item	16	40
Receivable [Member]
Derivative [Line Items]
Fair value hedged item	$ (18)	$ (36)