Derivative Financial Instruments - Additional Information (Detail) In Thousands, unless otherwise specified	9 Months Ended	1 Months Ended			1 Months Ended	9 Months Ended
	Sep. 30, 2013 W.E.T.	Mar. 31, 2008 W.E.T. Interest Rate Swap	Sep. 30, 2013 W.E.T. Interest Rate Swap USD ($)	Sep. 30, 2013 W.E.T. Interest Rate Swap EUR (€)	Mar. 31, 2013 Unicredit Bank EUR (€)	Sep. 30, 2013 Unicredit Bank USD ($)	Sep. 30, 2013 Unicredit Bank EUR (€)
Derivative Instruments [Line Items]
Derivative maturity period		10 years
Derivative notional amount			$ 13,508	€ 10,000
Derivative variable rate basis	six month EURIBOR
Fixed interest rate	0.45%
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						12,030	8,906
Past due payments under CRS						$ 6,659	€ 4,930