v3.26.1
Summary of Quantitative Inputs and Assumptions for Items Categorized in Level III of Fair Value Hierarchy (Detail)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets $ 6,157,534 $ 5,093,618
Level 3    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets 4,977,009 4,712,057
Fair value liabilities 1,151,709 1,124,744
Fair Value, Measurements, Recurring    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets 13,335,548 12,798,089
Fair value liabilities 1,267,320 1,254,114
Fair Value, Measurements, Recurring | Level 3    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets 4,977,009 4,712,057
Fair value liabilities 1,151,709 1,124,744
Fair Value, Measurements, Recurring | Level 3 | Loans and Receivables | Discounted Cash Flows    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets $ 425,981 $ 205,158
Fair Value, Measurements, Recurring | Level 3 | Minimum | Loans and Receivables | Discounted Cash Flows | Measurement Input, Discount Rate    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unobservable inputs, rate 7.60% 7.40%
Fair Value, Measurements, Recurring | Level 3 | Maximum | Loans and Receivables | Discounted Cash Flows | Measurement Input, Discount Rate    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unobservable inputs, rate 18.40% 18.30%
Fair Value, Measurements, Recurring | Level 3 | Weighted Average | Loans and Receivables | Discounted Cash Flows | Measurement Input, Discount Rate    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unobservable inputs, rate [1] 8.50% 8.30%
Fair Value, Measurements, Recurring | Level 3 | Other Investments | Discounted Cash Flows    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets [2] $ 598,541 $ 201,757
Fair Value, Measurements, Recurring | Level 3 | Other Investments | Minimum | Discounted Cash Flows | Measurement Input, Discount Rate    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unobservable inputs, rate [2] 7.20% 7.20%
Fair Value, Measurements, Recurring | Level 3 | Other Investments | Maximum | Discounted Cash Flows | Measurement Input, Discount Rate    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unobservable inputs, rate [2] 7.80% 7.90%
Fair Value, Measurements, Recurring | Level 3 | Other Investments | Weighted Average | Discounted Cash Flows | Measurement Input, Discount Rate    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unobservable inputs, rate [1],[2] 7.50% 7.50%
Fair Value, Measurements, Recurring | Level 3 | Freestanding Derivatives | Valuation Technique, Option Pricing Model    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value liabilities [3] $ 1,149,255  
Fair Value, Measurements, Recurring | Level 3 | Freestanding Derivatives | Valuation Technique, Option Pricing Model | Measurement Input, Price Volatility    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value liabilities [3]   $ 1,124,147
Fair Value, Measurements, Recurring | Level 3 | Freestanding Derivatives | Minimum | Valuation Technique, Option Pricing Model | Measurement Input, Price Volatility    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Volatility [3] 0.057 0.057
Fair Value, Measurements, Recurring | Level 3 | Freestanding Derivatives | Maximum | Valuation Technique, Option Pricing Model | Measurement Input, Price Volatility    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Volatility [3] 0.058 0.058
Fair Value, Measurements, Recurring | Level 3 | Freestanding Derivatives | Weighted Average | Valuation Technique, Option Pricing Model | Measurement Input, Price Volatility    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Volatility [1],[3] 0.057 0.057
Fair Value, Measurements, Recurring | Level 3 | Other Liabilities | Third Party Pricing Valuation Technique    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value liabilities [4] $ 2,454 $ 597
Fair Value, Measurements, Recurring | Level 3 | Consolidated Blackstone Funds    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets 3,908,184 4,124,090
Fair Value, Measurements, Recurring | Level 3 | Consolidated Blackstone Funds | Equity Securities, Partnerships and LLC Interests | Discounted Cash Flows    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets $ 3,886,718 $ 4,103,478
Fair Value, Measurements, Recurring | Level 3 | Consolidated Blackstone Funds | Equity Securities, Partnerships and LLC Interests | Minimum | Discounted Cash Flows | Measurement Input, Discount Rate    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unobservable inputs, rate 4.40% 4.30%
Fair Value, Measurements, Recurring | Level 3 | Consolidated Blackstone Funds | Equity Securities, Partnerships and LLC Interests | Minimum | Discounted Cash Flows | EBITDA Multiple Market    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Exit Multiple - EBITDA 0.058 0.05
Fair Value, Measurements, Recurring | Level 3 | Consolidated Blackstone Funds | Equity Securities, Partnerships and LLC Interests | Minimum | Discounted Cash Flows | Measurement Input, Cap Rate    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Exit Capitalization Rate 3.10% 3.10%
Fair Value, Measurements, Recurring | Level 3 | Consolidated Blackstone Funds | Equity Securities, Partnerships and LLC Interests | Maximum | Discounted Cash Flows | Measurement Input, Discount Rate    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unobservable inputs, rate 40.90% 41.10%
Fair Value, Measurements, Recurring | Level 3 | Consolidated Blackstone Funds | Equity Securities, Partnerships and LLC Interests | Maximum | Discounted Cash Flows | EBITDA Multiple Market    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Exit Multiple - EBITDA 0.266 0.306
Fair Value, Measurements, Recurring | Level 3 | Consolidated Blackstone Funds | Equity Securities, Partnerships and LLC Interests | Maximum | Discounted Cash Flows | Measurement Input, Cap Rate    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Exit Capitalization Rate 15.70% 15.30%
Fair Value, Measurements, Recurring | Level 3 | Consolidated Blackstone Funds | Equity Securities, Partnerships and LLC Interests | Weighted Average | Discounted Cash Flows | Measurement Input, Discount Rate    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unobservable inputs, rate [1] 10.20% 10.20%
Fair Value, Measurements, Recurring | Level 3 | Consolidated Blackstone Funds | Equity Securities, Partnerships and LLC Interests | Weighted Average | Discounted Cash Flows | EBITDA Multiple Market    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Exit Multiple - EBITDA [1] 0.156 0.166
Fair Value, Measurements, Recurring | Level 3 | Consolidated Blackstone Funds | Equity Securities, Partnerships and LLC Interests | Weighted Average | Discounted Cash Flows | Measurement Input, Cap Rate    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Exit Capitalization Rate [1] 5.10% 5.10%
Fair Value, Measurements, Recurring | Level 3 | Consolidated Blackstone Funds | Debt Instruments | Discounted Cash Flows    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets $ 21,466 $ 20,612
Fair Value, Measurements, Recurring | Level 3 | Consolidated Blackstone Funds | Debt Instruments | Minimum | Discounted Cash Flows | Measurement Input, Discount Rate    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unobservable inputs, rate 6.10% 6.10%
Fair Value, Measurements, Recurring | Level 3 | Consolidated Blackstone Funds | Debt Instruments | Maximum | Discounted Cash Flows | Measurement Input, Discount Rate    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unobservable inputs, rate 20.00% 20.00%
Fair Value, Measurements, Recurring | Level 3 | Consolidated Blackstone Funds | Debt Instruments | Weighted Average | Discounted Cash Flows | Measurement Input, Discount Rate    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unobservable inputs, rate [1] 12.70% 12.20%
Fair Value, Measurements, Recurring | Level 3 | Corporate Treasury Investments | Discounted Cash Flows    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets $ 44,303 $ 181,052
Fair Value, Measurements, Recurring | Level 3 | Corporate Treasury Investments | Minimum | Discounted Cash Flows | Measurement Input, Discount Rate    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unobservable inputs, rate   8.70%
Fair Value, Measurements, Recurring | Level 3 | Corporate Treasury Investments | Maximum | Discounted Cash Flows | Measurement Input, Discount Rate    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unobservable inputs, rate 8.60% 11.10%
Fair Value, Measurements, Recurring | Level 3 | Corporate Treasury Investments | Weighted Average | Discounted Cash Flows | Measurement Input, Discount Rate    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unobservable inputs, rate [1] 8.60% 9.90%
[1] Unobservable inputs were weighted based on the fair value of the investments included in the range.
[2] As of March 31, 2026 and December 31, 2025, Other Investments includes Level III Freestanding Derivatives.
[3] The volatility of the historical performance of the underlying reference entities or an appropriate proxy is used to project the expected returns relevant for the fair value of the derivatives.
[4] As of March 31, 2026 and December 31, 2025, Other Liabilities includes Level III Contingent Consideration and Level III Corporate Treasury Commitments.