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Financial Instruments - Changes in Fair Value of Asset Measured on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value Disclosures [Abstract]    
Fair value at beginning of year $ (2,137) $ 6,344
Realized and unrealized (losses) gains included in earnings (5,039) (7,161)
Settlements 880 (1,320)
Fair value at end of year $ (6,296) $ (2,137)