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Financial Instruments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Fair Value Of Financial Instruments [Line Items]
Cash and cash equivalents	$ 19,227	$ 22,661	$ 6,926	$ 22,994
U.S. dollar-denominated transaction total	5,500
Market value adjustment	0
Foreign Countries [Member]
Fair Value Of Financial Instruments [Line Items]
Cash and cash equivalents	$ 12,200	$ 17,600

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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