Derivative Financial Instruments - Additional Information (Detail) In Thousands, unless otherwise specified	3 Months Ended	1 Months Ended			3 Months Ended
	Mar. 31, 2013 W.E.T.	Mar. 31, 2008 W.E.T. Interest Rate Swap	Mar. 31, 2013 W.E.T. Interest Rate Swap USD ($)	Mar. 31, 2013 W.E.T. Interest Rate Swap EUR (€)	Mar. 31, 2013 UniCredit USD ($)	Mar. 31, 2013 UniCredit EUR (€)
Derivative Instruments [Line Items]
Derivative maturity period		10 years
Derivative notional amount			$ 12,816	€ 10,000
Derivative variable rate basis	Six month EURIBOR
Base rate	0.34%
Basis spread on variable rate	1.40%
Exchange rate	1.22
Derivative exchange rate	1.46
Legal settlement for CRS						144
Costs of all future obligations under CRS					13,045	10,179
Past due payments under CRS					$ 5,126	€ 4,000