Derivative Financial Instruments - Additional Information (Detail) In Thousands, unless otherwise specified	12 Months Ended			1 Months Ended
	Dec. 31, 2012 W.E.T.	Dec. 31, 2012 Interest Rate Swap USD ($)	Dec. 31, 2011 Interest Rate Swap USD ($)	Mar. 31, 2008 Interest Rate Swap W.E.T.	Dec. 31, 2012 Interest Rate Swap W.E.T. USD ($)	Dec. 31, 2012 Interest Rate Swap W.E.T. EUR (€)
Derivative Instruments [Line Items]
Derivative maturity period				10 years
Derivative notional amount					$ 13,203	€ 10,000
Derivative variable rate basis	Six month EUIBOR
Base rate	0.43%
Basis spread on variable rate	1.40%
Exchange rate	1.21
Derivative exchange rate	1.46
Hedge ineffectiveness incurred		0	0
Interest payments expense		$ 164	$ 42