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Financial Guarantee Liability - Summary of Provisions for Risk Sharing (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Guarantees [Abstract]      
Increase (decrease) to financial guarantee liability $ (14) $ 41 $ (7)
Decrease (increase) to credit enhancement asset [1]     10
Total expense $ (14) $ 41 $ 3
[1] The credit enhancement recievable is included in “Other assets” in the accompanying consolidated balance sheets.