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Components of Net Periodic Pension Cost (Detail) (Retirement Plan, USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Retirement Plan
       
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 4 $ 326 $ 134 $ 977
Interest cost 410 451 1,218 1,353
Amortization of prior service cost   73   219
Recognized net actuarial loss 239 145 733 437
Curtailment loss     234  
Net periodic benefit cost $ 653 $ 995 $ 2,319 $ 2,986