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Interest Rate Swap Terms and Positions (Detail) (Interest rate swaps, USD $)
In Thousands, unless otherwise specified
Jun. 30, 2011
Dec. 31, 2010
Interest rate swaps
   
Derivative [Line Items]    
Term Through June 2013  
Amount $ 100,000  
Swap Interest Rates - Pay 8.175% [1]  
Swap Interest Rates - Receive 10.375% [1]  
Position $ 2,715 $ 2,590
[1] References to LIBOR represent the 3-month rate.