Derivative Financial Instruments - Additional Information (Detail) In Thousands, unless otherwise specified	12 Months Ended			1 Months Ended			0 Months Ended	12 Months Ended
	Dec. 31, 2014 Interest Rate Swap USD ($)	Dec. 31, 2013 Interest Rate Swap USD ($)	Dec. 31, 2014 W.E.T	Mar. 31, 2008 W.E.T Interest Rate Swap	Dec. 31, 2014 W.E.T Interest Rate Swap USD ($)	Dec. 31, 2014 W.E.T Interest Rate Swap EUR (€)	Mar. 25, 2013 Unicredit Bank EUR (€)	Dec. 31, 2014 Unicredit Bank USD ($)	Dec. 31, 2014 Unicredit Bank EUR (€)
Derivative Instruments [Line Items]
Derivative maturity period				10 years
Notional Value					$ 12,133	€ 10,000
Variable Rate			six month EURIBOR
Fixed interest rate			0.17%
Basis spread on variable rate			1.40%
Exchange rate			1.20
Derivative exchange rate			1.46
Legal settlement for CRS							144
Costs of all future obligations under CRS								9,164	7,553
Past due payments under CRS								8,670	7,146
Hedge Ineffectiveness Incurred	$ 0	$ 0