Derivative Instruments and Hedging Activities - Additional Information (Detail) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Fair value of foreign currency forward contracts, liability	$ 761,000	$ 673,000
Not Designated as Hedging Instrument [Member] \| Other Current Liabilities [Member] \| Foreign Exchange Forward [Member]
Derivatives, Fair Value [Line Items]
Fair value of foreign currency forward contracts, liability	$ 761,000	$ 673,000

Fair value as of the balance sheet date of all foreign currency derivative liabilities not designated as hedging instruments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant