Related Party Transactions - Summary of Components of Due to Affiliates (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Related Party Transaction [Line Items]
Total components due to affiliates	$ 613,055	$ 690,143
Accrued Stockholder Servicing Fee [Member]
Related Party Transaction [Line Items]
Total components due to affiliates	558,132	478,539
Performance Participation Allocation [Member]
Related Party Transaction [Line Items]
Total components due to affiliates		141,396
Accrued Management Fee [Member]
Related Party Transaction [Line Items]
Total components due to affiliates	18,207	13,873
Advanced Organization and Offering Costs [Member]
Related Party Transaction [Line Items]
Total components due to affiliates	5,113	6,136
Accrued Affiliate Service Provider Expenses [Member]
Related Party Transaction [Line Items]
Total components due to affiliates	11,629	6,037
Other [Member]
Related Party Transaction [Line Items]
Total components due to affiliates	$ 19,974	$ 44,162