Schedule of Derivatives (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Derivative [Line Items]
Notional Amount	$ 9,956		$ 9,956		$ 21,077
Fair Value Gain			13		9
Fair Value Loss			(16)		(239)
Gain	46	125	156	221
Pay fixed interest rate swaps
Derivative [Line Items]
Notional Amount	714		714		11,721
Fair Value Loss			(16)		(239)
Gain	44	125	152	221
Interest rate cap
Derivative [Line Items]
Notional Amount	9,242		9,242		9,356
Fair Value Gain			13		9
Gain	$ 2		$ 4