Schedule I - Parent Company Only Financial Statements - Statements of Financial Condition (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets
Cash and cash equivalents	$ 415,379	$ 336,535
Receivables from related parties	14,273	7,748
Other assets	446,371	246,937
Total assets	3,916,120	3,432,757
Liabilities, Redeemable Partnership Interest, and Equity
Accounts payable, accrued and other liabilities	1,283,046	754,819
Total liabilities	3,148,745	2,544,877
Commitments and contingencies (Note 2)
Total stockholders’ equity	685,826	768,373
Total liabilities, redeemable partnership interest, and equity	3,916,120	3,432,757
Parent Company [Member]
Assets
Cash and cash equivalents	44	155
Investments in subsidiaries	669,402	757,298
Receivables from related parties	3,999	20,028
Note receivable from related party	1,109,013	742,517
Other assets	49,252	31,721
Total assets	1,831,710	1,551,719
Liabilities, Redeemable Partnership Interest, and Equity
Accounts payable, accrued and other liabilities	36,871	40,829
Notes payable	1,109,013	742,517
Total liabilities	1,145,884	783,346
Commitments and contingencies (Note 2)
Total stockholders’ equity	685,826	768,373
Total liabilities, redeemable partnership interest, and equity	$ 1,831,710	$ 1,551,719