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Pensions - Reconciliation for Level 3 Inputs Used in Determining Fair Value (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance of assets classified as Level 3 $ 13,824 $ 17,133
Purchases, sales and settlements, net (5,222) (2,987)
Total losses (1,999) (136)
Transfers into (out of) Level 3 5,855 (186)
Ending balance of assets classified as Level 3 $ 12,458 $ 13,824