Reserve for Known and Incurred but Not Reported Claims - Reconciliation of the Net Incurred and Paid Claims Development Tables to the Liability for Claims and Claim Adjustment Expense (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Shortduration Insurance Contracts Liability For Unpaid Claims And Allocated Claim Adjustment Expense Net [Abstract]
Liability for unpaid claims and claim adjustment expenses, net of reinsurance	$ 68,200
Reinsurance recoverable on unpaid claims: Specialty insurance	5,991
Unallocated claims adjustment expenses: Specialty insurance	1,477
Title insurance	987,376	$ 957,440
Total loss reserves, amount	$ 1,063,044	$ 1,042,679	$ 1,028,933	$ 1,025,863