v2.4.0.8
Summary of Quantitative Inputs and Assumptions for Items Categorized in Level III of Fair Value Hierarchy (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets $ 8,895,688 $ 11,281,064
Fair value liabilities 8,913,007 11,541,607
Discounted Cash Flows | Collateralized Loan Obligations
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Recovery Lag 12 months 12 months
Discounted Cash Flows | Collateralized Loan Obligations | LIBOR
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Reinvestment Rate 4.00% 4.00%
Discounted Cash Flows | Collateralized Loan Obligations | Weighted Average
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Discount Rate 2.60% [1] 3.90% [1]
Pre-payment Rate 18.00% [1] 18.00% [1]
Recovery Rate 66.00% [1] 66.00% [1]
Default Rate 2.10% [1] 2.10% [1]
Discounted Cash Flows | Collateralized Loan Obligations | Minimum
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Discount Rate 0.40% 1.10%
Pre-payment Rate 5.00% 5.00%
Recovery Rate 30.00% 30.00%
Default Rate 2.00% 2.00%
Discounted Cash Flows | Collateralized Loan Obligations | Maximum
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Discount Rate 24.20% 50.00%
Pre-payment Rate 20.00% 20.00%
Recovery Rate 70.00% 70.00%
Default Rate 3.00% 5.00%
Level 3
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets 3,555,138 3,076,466
Level 3 | Discounted Cash Flows | Collateralized Loan Obligations
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value liabilities 8,913,007 11,541,607
Blackstone's Treasury Cash Management Strategies | Discounted Cash Flows
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Discount Rate   12.00%
Pre-payment Rate 20.00% 20.00%
Recovery Lag 12 months 12 months
Recovery Rate   70.00%
Default Rate 2.00% 2.00%
Blackstone's Treasury Cash Management Strategies | Discounted Cash Flows | LIBOR
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Reinvestment Rate 4.00% 4.00%
Blackstone's Treasury Cash Management Strategies | Discounted Cash Flows | Weighted Average
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Discount Rate 6.60% [1]  
Recovery Rate 66.00% [1]  
Blackstone's Treasury Cash Management Strategies | Discounted Cash Flows | Minimum
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Discount Rate 6.00%  
Recovery Rate 30.00%  
Blackstone's Treasury Cash Management Strategies | Discounted Cash Flows | Maximum
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Discount Rate 8.60%  
Recovery Rate 70.00%  
Blackstone's Treasury Cash Management Strategies | Level 3 | Discounted Cash Flows
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets 17,040 1,006
Blackstone's Treasury Cash Management Strategies | Level 3 | Net Asset Value Valuation Technique
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets 10,099  
Blackstone's Treasury Cash Management Strategies | Level 3 | Transaction Price Valuation Technique
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets   200
Blackstone's Treasury Cash Management Strategies | Level 3 | Third Party Pricing Valuation Technique
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets 16,993  
Loans And Receivables | Discounted Cash Flows | Weighted Average
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Discount Rate 12.60% [1] 13.70% [1]
Loans And Receivables | Discounted Cash Flows | Minimum
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Discount Rate 11.00% 11.80%
Loans And Receivables | Discounted Cash Flows | Maximum
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Discount Rate 14.80% 25.90%
Loans And Receivables | Market Comparable Companies
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
EBITDA Multiple   8.7
Loans And Receivables | Level 3 | Discounted Cash Flows
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets 137,788 30,620
Loans And Receivables | Level 3 | Market Comparable Companies
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets   43
Other | Discounted Cash Flows
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Discount Rate 12.50% 12.50%
Other | Level 3 | Discounted Cash Flows
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets 2,814 5,647
Other | Level 3 | Net Asset Value Valuation Technique
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets 3,725 17,901
Other | Level 3 | Transaction Price Valuation Technique
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets 7,927 3,350
Investments Of Consolidated Blackstone Funds | Level 3
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets 3,358,752 3,017,699
Investments Of Consolidated Blackstone Funds | Consolidated Equity Securities | Discounted Cash Flows | Weighted Average
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Discount Rate 12.40% [1] 11.20% [1]
Revenue CAGR 6.80% [1] 5.60% [1]
Exit Multiple - EBITDA 8.9 [1] 9.2 [1]
Exit Multiple - P/E 9.8 [1] 10.1 [1]
Investments Of Consolidated Blackstone Funds | Consolidated Equity Securities | Discounted Cash Flows | Minimum
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Discount Rate 9.20% 8.40%
Revenue CAGR 0.90% 0.70%
Exit Multiple - EBITDA 5.0 5.8
Exit Multiple - P/E 8.5 8.5
Investments Of Consolidated Blackstone Funds | Consolidated Equity Securities | Discounted Cash Flows | Maximum
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Discount Rate 26.30% 25.10%
Revenue CAGR 46.20% 83.40%
Exit Multiple - EBITDA 14.0 11.5
Exit Multiple - P/E 17.0 17.0
Investments Of Consolidated Blackstone Funds | Consolidated Equity Securities | Market Comparable Companies
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Book Value Multiple   0.9
Investments Of Consolidated Blackstone Funds | Consolidated Equity Securities | Market Comparable Companies | Weighted Average
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
EBITDA Multiple 6.9 [1] 7.8 [1]
Investments Of Consolidated Blackstone Funds | Consolidated Equity Securities | Market Comparable Companies | Minimum
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
EBITDA Multiple 6.3 5.0
Investments Of Consolidated Blackstone Funds | Consolidated Equity Securities | Market Comparable Companies | Maximum
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
EBITDA Multiple 7.5 8.7
Investments Of Consolidated Blackstone Funds | Consolidated Equity Securities | Level 3 | Discounted Cash Flows
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets 112,117 151,899
Investments Of Consolidated Blackstone Funds | Consolidated Equity Securities | Level 3 | Market Comparable Companies
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets 275 1,602
Investments Of Consolidated Blackstone Funds | Consolidated Equity Securities | Level 3 | Transaction Price Valuation Technique
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets 78,154 61,479
Investments Of Consolidated Blackstone Funds | Consolidated Equity Securities | Level 3 | Third Party Pricing Valuation Technique
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets 50 200
Investments Of Consolidated Blackstone Funds | Consolidated Equity Securities | Level 3 | Other
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets 3,103 1,880
Investments Of Consolidated Blackstone Funds | Partnership And LLC Interests | Discounted Cash Flows | Weighted Average
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Discount Rate 9.00% [1] 8.90% [1]
Revenue CAGR 5.50% [1] 5.30% [1]
Exit Multiple - EBITDA 9.4 [1] 10.0 [1]
Exit Capitalization Rate 7.00% [1] 7.00% [1]
Investments Of Consolidated Blackstone Funds | Partnership And LLC Interests | Discounted Cash Flows | Minimum
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Discount Rate 5.00% 5.30%
Revenue CAGR (0.70%) (8.20%)
Exit Multiple - EBITDA 3.0 4.5
Exit Capitalization Rate 4.30% 1.00%
Investments Of Consolidated Blackstone Funds | Partnership And LLC Interests | Discounted Cash Flows | Maximum
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Discount Rate 22.50% 22.60%
Revenue CAGR 17.70% 62.00%
Exit Multiple - EBITDA 23.3 15.4
Exit Capitalization Rate 10.50% 10.50%
Investments Of Consolidated Blackstone Funds | Partnership And LLC Interests | Level 3 | Discounted Cash Flows
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets 557,534 562,678
Investments Of Consolidated Blackstone Funds | Partnership And LLC Interests | Level 3 | Transaction Price Valuation Technique
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets 687,246 13,316
Investments Of Consolidated Blackstone Funds | Partnership And LLC Interests | Level 3 | Third Party Pricing Valuation Technique
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets 9,181 5,157
Investments Of Consolidated Blackstone Funds | Partnership And LLC Interests | Level 3 | Other
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets 942  
Investments Of Consolidated Blackstone Funds | Debt Instruments | Discounted Cash Flows
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Pre-payment Rate 20.00% 20.00%
Recovery Lag 12 months 12 months
Recovery Rate 67.00% 70.00%
Default Rate 2.00% 2.00%
Exit Multiple - EBITDA   9.5
Investments Of Consolidated Blackstone Funds | Debt Instruments | Discounted Cash Flows | LIBOR
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Reinvestment Rate 4.00% 4.00%
Investments Of Consolidated Blackstone Funds | Debt Instruments | Discounted Cash Flows | Weighted Average
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Discount Rate 19.20% [1] 15.60% [1]
Revenue CAGR 4.80% [1] 3.80% [1]
Exit Multiple - EBITDA 10.8 [1]  
Exit Capitalization Rate 6.70% [1] 7.10% [1]
Investments Of Consolidated Blackstone Funds | Debt Instruments | Discounted Cash Flows | Minimum
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Discount Rate 10.70% 7.80%
Revenue CAGR 4.80% 2.90%
Exit Multiple - EBITDA 5.8  
Exit Capitalization Rate 6.40% 7.00%
Investments Of Consolidated Blackstone Funds | Debt Instruments | Discounted Cash Flows | Maximum
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Discount Rate 21.00% 42.00%
Revenue CAGR 5.50% 5.10%
Exit Multiple - EBITDA 11.1  
Exit Capitalization Rate 7.50% 7.50%
Investments Of Consolidated Blackstone Funds | Debt Instruments | Market Comparable Companies | Weighted Average
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
EBITDA Multiple 6.2 [1] 6.7 [1]
Investments Of Consolidated Blackstone Funds | Debt Instruments | Market Comparable Companies | Minimum
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
EBITDA Multiple 6.2 6.5
Investments Of Consolidated Blackstone Funds | Debt Instruments | Market Comparable Companies | Maximum
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
EBITDA Multiple 8.0 7.5
Investments Of Consolidated Blackstone Funds | Debt Instruments | Level 3 | Discounted Cash Flows
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets 11,814 13,056
Investments Of Consolidated Blackstone Funds | Debt Instruments | Level 3 | Market Comparable Companies
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets 234 664
Investments Of Consolidated Blackstone Funds | Debt Instruments | Level 3 | Transaction Price Valuation Technique
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets 1,772  
Investments Of Consolidated Blackstone Funds | Debt Instruments | Level 3 | Third Party Pricing Valuation Technique
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets 31,675 4,004
Investments Of Consolidated Blackstone Funds | Assets Of Consolidated CLO Vehicles | Discounted Cash Flows
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Revenue CAGR 4.20%  
Exit Multiple - EBITDA 8.0  
Investments Of Consolidated Blackstone Funds | Assets Of Consolidated CLO Vehicles | Discounted Cash Flows | Weighted Average
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Discount Rate 7.80% [1] 9.30% [1]
Investments Of Consolidated Blackstone Funds | Assets Of Consolidated CLO Vehicles | Discounted Cash Flows | Minimum
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Discount Rate 7.00% 7.00%
Investments Of Consolidated Blackstone Funds | Assets Of Consolidated CLO Vehicles | Discounted Cash Flows | Maximum
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Discount Rate 14.00% 15.70%
Investments Of Consolidated Blackstone Funds | Assets Of Consolidated CLO Vehicles | Market Comparable Companies | Weighted Average
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
EBITDA Multiple 7.3 [1] 6.5 [1]
Liquidity Discount   8.40% [1]
Investments Of Consolidated Blackstone Funds | Assets Of Consolidated CLO Vehicles | Market Comparable Companies | Minimum
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
EBITDA Multiple 3.5 2.0
Liquidity Discount   1.00%
Investments Of Consolidated Blackstone Funds | Assets Of Consolidated CLO Vehicles | Market Comparable Companies | Maximum
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
EBITDA Multiple 11.3 13.0
Liquidity Discount   25.00%
Investments Of Consolidated Blackstone Funds | Assets Of Consolidated CLO Vehicles | Level 3 | Discounted Cash Flows
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets 57,936 132,171
Investments Of Consolidated Blackstone Funds | Assets Of Consolidated CLO Vehicles | Level 3 | Market Comparable Companies
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets 293,382 278,972
Investments Of Consolidated Blackstone Funds | Assets Of Consolidated CLO Vehicles | Level 3 | Transaction Price Valuation Technique
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets 80 10
Investments Of Consolidated Blackstone Funds | Assets Of Consolidated CLO Vehicles | Level 3 | Third Party Pricing Valuation Technique
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets 615,414 900,146
Investments Of Consolidated Blackstone Funds | Investment Funds | Level 3 | Net Asset Value Valuation Technique
   
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair value assets $ 897,843 $ 890,465
[1] Unobservable inputs were weighted based on the fair value of the investments included in the range.