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Commitments and Contingencies - Reconciliation of Expected Aggregate Non-inflated, Undiscounted Amount to Amount Recognized in Statements of Financial Position (Detail)
$ in Thousands
Dec. 31, 2015
USD ($)
Accrual for Environmental Loss Contingencies, Rolling Maturity [Abstract]  
Undiscounted liability $ 5,198
Plus inflation 23
Liability balance $ 5,221