Fair Value Measurements - Reconciliation of the Beginning and Ending Balances for Derivative Instruments Classified as Level 3 in the Fair Value Hierarchy (Detail) - Fair Value, Inputs, Level 3 $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance at the beginning of period	$ 5,766
Total gains (losses) included in earnings	0
Settlements received	(7,692)
Transfers in and/or out of Level 3	(2,922)
Balance at end of period	$ (4,848)