Interest Rate Swap Terms and Positions (Detail) (Interest rate swaps, USD $) In Thousands, unless otherwise specified	Mar. 31, 2012
Interest rate swaps
Derivative [Line Items]
Term	Through April 15, 2019
Notional Amount	$ 100,000
Swap Interest Rates - Pay, LIBOR plus	5.68%	[1]
Swap Interest Rates - Receive	7.25%	[1]
Fair Value	$ (599)

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