Interest Rate Swap Terms and Positions (Detail) (Interest rate swaps, USD $) In Thousands, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Interest rate swaps
Derivative [Line Items]
Term	Through June 2013
Notional Amount	$ 100,000
Swap Interest Rates - Pay, LIBOR plus	8.175%	[1]
Swap Interest Rates - Receive	10.375%	[1]
Fair Value			$ 2,590

[1] References to LIBOR represent the 3-month rate.