Interest Rate Swap Contracts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Interest Rate Swap 1 [Member]
Derivative [Line Items]
Contract Term	Jun. 30, 2014
Notional Value	$ 8,000
Hedged Instruments	US Term Note
Fixed Rate	1.27%
Variable Rate	3 month LIBOR
Interest Rate Swap 2 [Member]
Derivative [Line Items]
Contract Term	Jun. 30, 2014
Notional Value	8,000
Hedged Instruments	US Term Note
Fixed Rate	1.27%
Variable Rate	3 month LIBOR
Interest Rate Cap [Member]
Derivative [Line Items]
Contract Term	Mar. 31, 2016
Notional Value	$ 14,250
Hedged Instruments	W.E.T. Term Note
Variable Rate	3 month EURIBOR
Rate Cap	2.75%