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Components of Net Periodic Pension (Credit) Expense (Detail) - Pension Benefits - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Components of net periodic pension credit:      
Interest cost $ 6,063 $ 5,895 $ 5,455
Expected return on plan assets (17,559) (19,435) (16,588)
Amortization of net actuarial loss 8,208 3,289 9,406
Net periodic pension (credit) expense $ (3,288) $ (10,251) $ (1,727)