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Fair Value Measurements - Reconciliation of the Beginning and Ending Balances for Derivative Instruments Classified as Level 3 in the Fair Value Hierarchy (Detail) - Level 3
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]  
Balance at December 31, 2017 $ 6,658
Total losses included in earnings 1,876
Settlements (4,690)
Transfer out of Level 3 (2,947) [1]
Balance at September 30, 2018 $ 897
[1] During first nine months 2018, we transferred $2.9 million of swaption contracts out of Level 3 due to the exercise of these swaptions by our counterparties.