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Fair Value of Financial Instruments - Summary of Rollforward of Level 3 Assets Held at Fair Value on Recurring Basis (Detail) - Significant Unobservable Inputs (Level 3) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance, beginning of period $ 2,182 $ 3,169
Gains included in net income 0 396
Settlements 0 (1,000)
Unrealized gains (losses) in OCI 89 (383)
Balance, end of period $ 2,271 $ 2,182