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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Summary Of Significant Accounting Policies [Line Items]            
Partners capital $ 6,987,517   $ 6,987,517   $ 6,634,493  
Total revenues 1,926,580 $ 1,735,358 6,328,281 $ 5,185,802    
Net income attributable to The Blackstone Group L.P. $ 442,742 $ 377,920 $ 1,552,656 $ 1,167,236    
Common Units, Basic $ 0.65 $ 0.57 $ 2.28 $ 1.76    
Common Units, Diluted $ 0.64 $ 0.55 $ 2.27 $ 1.73    
Net Cash provided (used) by/in Operating Activities     $ (1,339,810) $ (1,230,869)    
Net Cash provided (used) by/in Investing Activities     (8,760) (20,405)    
Effect of Exchange Rate Changes on Cash and Cash Equivalents, Cash Held by Blackstone Funds, and Restricted Cash     9,513 105,716    
Cash and Cash Equivalents, Cash Held by Blackstone Funds and Other, and Restricted Cash $ 2,346,524 $ 2,989,488 $ 2,346,524 2,989,488 3,936,489 $ 2,860,955
Accounting Standards Update 2014-09 [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Partners capital         $ 1,900 2,400
Total revenues   11,400   51,100    
Net income attributable to The Blackstone Group L.P.   $ 6,700   $ 22,000    
Common Units, Basic   $ 0.01   $ 0.03    
Common Units, Diluted   $ 0.01   $ 0.03    
Accounting Standards Update 2014-09 [Member] | General and Administrative Expense [Member] | Management Service            
Summary Of Significant Accounting Policies [Line Items]            
Cost of investment management services   $ 5,300   $ 12,900    
Accounting Standards Update 2016-18 [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Net Cash provided (used) by/in Operating Activities       573,400    
Net Cash provided (used) by/in Investing Activities       11,400    
Effect of Exchange Rate Changes on Cash and Cash Equivalents, Cash Held by Blackstone Funds, and Restricted Cash       88,100    
Cash and Cash Equivalents, Cash Held by Blackstone Funds and Other, and Restricted Cash   $ 1,700,000   $ 1,700,000   $ 1,000,000