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Employee Benefit Plans - Summary of Components of Net Pension Plan Expense (Detail) - Pension Plan [Member] - Partnership in Care Benefits Plan [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]    
Interest cost on projected benefit obligation $ 1,605 $ 1,602
Expected return on assets (2,538) (1,319)
Net pension expense $ (933) $ 283