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Fair Value Measurements - Changes in Level 3 Assets Measured at Estimated Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation Calculation Roll Forward    
Balance at the beginning of the year $ 13,443 $ 14,467
Settlements (695) (1,037)
Total unrealized gains/(losses) (34) 13
Balance at the end of the period $ 12,714 $ 13,443