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Other Assets - Summary of Other Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]    
Benefits receivable related to retrospective reinsurance contract $ 6,240 $ 9,480
Prepaid expenses 2,735 2,107
Deposits 3,446 1,678
Lease acquisition costs, net 468 566
Right-of-use assets – operating leases 5,668 484
Other 1,819 2,765
Total other assets $ 20,376 $ 17,080