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	Dec. 31, 2014	Dec. 31, 2013
Other Current Liabilities [Member]
Derivative [Line Items]
Cash flow hedge contracts	$ 6	$ 0
Fair value hedge contracts	399	0
Fair value hedged item	218	488
Other Current Assets [Member]
Derivative [Line Items]
Fair value hedge contracts	217	426
Fair value hedged item	327	0
Other Noncurrent Assets [Member]
Derivative [Line Items]
Fair value hedge contracts	15	17
Fair value hedged item	4	0
Other Noncurrent Liabilities [Member]
Derivative [Line Items]
Fair value hedge contracts	5	0
Fair value hedged item	35	40
Receivable [Member]
Derivative [Line Items]
Fair value hedged item	$ 69	$ (36)