FAIR VALUE MEASUREMENTS - Summary of Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Assets
Loans held for sale	$ 1,811,586	$ 2,449,198
Pledged securities	148,996	137,236	$ 121,767	$ 116,331
Derivative assets	37,364	49,786
Liabilities
Derivative liabilities	6,403	5,066
Contingent consideration	125,808	28,829	$ 5,752
Recurring Basis
Assets
Loans held for sale	1,811,586	2,449,198
Pledged securities	148,996	137,236
Derivative assets	37,364	49,786
Total financial assets	1,997,946	2,636,220
Liabilities
Derivative liabilities	6,403	5,066
Contingent consideration	125,808	28,829
Total financial liabilities	132,211	33,895
Level 1 | Recurring Basis
Assets
Pledged securities	44,733	17,473
Total financial assets	44,733	17,473
Level 2 | Recurring Basis
Assets
Loans held for sale	1,811,586	2,449,198
Pledged securities	104,263	119,763
Total financial assets	1,915,849	2,568,961
Level 3 | Recurring Basis
Assets
Derivative assets	37,364	49,786
Total financial assets	37,364	49,786
Liabilities
Derivative liabilities	6,403	5,066
Contingent consideration	125,808	28,829
Total financial liabilities	$ 132,211	$ 33,895