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Fair Value Measurements - Changes in Level 3 Assets Measured at Estimated Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation Calculation Roll Forward    
Balance at the beginning of the year $ 12,714 $ 13,443
Transfers from level 2 1,644  
Settlements (1,047) (695)
Total unrealized losses (7) (34)
Balance at the end of the period $ 13,304 $ 12,714