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Activity Related to Interest Rate Swap Agreement (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Derivative Instruments And Hedging Activities Disclosure [Abstract]        
Current period increase (decrease) in fair value recognized in OCI $ 207 $ (1) $ 856 $ (168)
Tax effect (82) (1) (334) 65
Unrealized gain (loss) on interest rate swap, net of tax 125 (2) 522 (103)
Loss reclassified from OCI to interest expense 286 432 968 1,376
Amount excluded from Effectiveness Assessment and Ineffective Portion Gain (loss) recognized in other income (expense) $ 0 $ 0 $ 0 $ 0