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Defined Benefit Plans - Net Periodic Cost (Benefit) (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract]        
Expected return on plan assets, net of expenses $ (2,983) $ (3,128) $ (5,966) $ (6,257)
Interest cost on projected benefit obligation 2,053 2,000 4,105 4,001
Net amortization and deferral 1,749 671 3,498 1,343
Net periodic expense (benefit) $ 819 $ (457) $ 1,637 $ (913)