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Commitments, Contingencies and Legal Proceedings - Schedule of Reserves (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Environmental Remediation Obligations [Abstract]    
Beginning balance $ 16,223 $ 16,276
Payments (9,118) (53)
Accruals 10,000  
Ending balance $ 17,105 $ 16,223