Investments (Detail) - USD ($) $ in Thousands |
Dec. 31, 2019 |
Dec. 31, 2018 |
|---|---|---|
| Schedule of Investments [Line Items] | ||
| Investments | $ 22,281,682 | $ 20,377,031 |
| Partnership Investments | ||
| Schedule of Investments [Line Items] | ||
| Investments | 4,035,675 | 3,649,423 |
| Accrued Performance Allocations | ||
| Schedule of Investments [Line Items] | ||
| Investments | 7,180,449 | 5,883,924 |
| Other Investments | ||
| Schedule of Investments [Line Items] | ||
| Investments | 265,273 | 260,853 |
| Consolidated Blackstone Funds | ||
| Schedule of Investments [Line Items] | ||
| Investments | 8,380,698 | 8,376,338 |
| Corporate Treasury Investments | ||
| Schedule of Investments [Line Items] | ||
| Investments | $ 2,419,587 | $ 2,206,493 |