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Pension Plans - Components of Net Periodic Benefit Cost (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
Compensation And Retirement Disclosure [Abstract]        
Service cost $ 56 $ 325 $ 167 $ 975
Interest cost 313 353 938 1,058
Expected return on plan assets (359) (297) (1,077) (890)
Recognized net actuarial loss 123 187 370 562
Net periodic benefit cost $ 133 $ 568 $ 398 $ 1,705