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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
12 Months Ended
Dec. 31, 2018
USD ($)
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]  
Balance at the beginning of period $ 6,658
Total gains (losses) included in earnings 5,766
Settlements received (7,277)
Transfers in and/or out of Level 3 619
Balance at end of period $ 5,766