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Financial Instruments - Additional Information (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2014 Foreign Countries [Member]	Dec. 31, 2013 Foreign Countries [Member]	Mar. 31, 2014 Foreign Exchange Contract [Member]
Fair Value Of Financial Instruments [Line Items]
Cash and cash equivalents	$ 18,039,000	$ 22,661,000	$ 13,586,000	$ 22,994,000	$ 12,000,000	$ 17,600,000
U.S. dollar-denominated transaction total							$ 5,500,000

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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