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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Accounting Policies [Abstract]
Foreign exchange loss recognized	$ 145,000	$ 175,000

Aggregate realized and unrealized loss on foreign currency transactions included in net income. Includes loss on a foreign currency forward exchange contract. Does not include foreign currency transactions designated as hedges of net investment in a foreign entity or intercompany foreign currency transactions that are of a long-term nature. Gross of tax effect.

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