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Derivative Instruments - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Derivatives, Fair Value [Line Items]
Net foreign currency gain (loss)	$ 504,000	$ 880,000	$ 504,000	$ 328,000
U.S. Dollar/Euro [Member]
Derivatives, Fair Value [Line Items]
Outstanding forward contracts		$ 3,590,000

Aggregate impact of foreign currency derivatives on earnings for the period. Includes impact of foreign currency cash flow hedge ineffectiveness and the ineffectiveness of fair value hedging derivatives and full change in fair value of the foreign currency derivatives not designated as hedging instruments.

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