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Pension Plans - Components of Net Periodic Benefit Cost (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Compensation And Retirement Disclosure [Abstract]        
Service cost $ 74 $ 351 $ 111 $ 650
Interest cost 314 361 626 705
Expected return on plan assets (351) (295) (718) (593)
Recognized net actuarial loss 123 199 247 375
Net periodic benefit cost $ 159 $ 616 $ 265 $ 1,137