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Defined Benefit Plans - Net Periodic Cost (Benefit) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract]        
Expected return on plan assets, net of expenses $ (2,983) $ (3,129) $ (8,949) $ (9,386)
Interest cost on projected benefit obligation 2,052 2,001 6,157 6,002
Net amortization and deferral 1,748 672 5,246 2,015
Net periodic expense (benefit) $ 817 $ (456) $ 2,454 $ (1,369)