Derivative Financial Instruments - Additional Information (Detail) In Thousands, unless otherwise specified	6 Months Ended	1 Months Ended			1 Months Ended	6 Months Ended
	Jun. 30, 2013 W.E.T.	Mar. 31, 2008 W.E.T. Interest Rate Swap	Mar. 31, 2013 W.E.T. Interest Rate Swap USD ($)	Mar. 31, 2013 W.E.T. Interest Rate Swap EUR (€)	Mar. 31, 2013 Unicredit Bank EUR (€)	Jun. 30, 2013 Unicredit Bank USD ($)	Jun. 30, 2013 Unicredit Bank EUR (€)
Derivative Instruments [Line Items]
Derivative maturity period		10 years
Derivative notional amount			$ 13,007	€ 10,000
Derivative variable rate basis	six month EURIBOR
Fixed interest rate	0.34%
Basis spread on variable rate	1.40%
Exchange rate	1.23
Derivative exchange rate	1.46
Legal settlement for CRS					144
Costs of all future obligations under CRS						12,305	9,460
Past due payments under CRS						$ 5,264	€ 4,047