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Recently Issued and Adopted Accounting Standards - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 28, 2018
Sep. 28, 2018
Jan. 01, 2018
Dec. 31, 2017
Sep. 29, 2017
Dec. 31, 2016
ASU 2014-09 [Member]            
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]            
Impact to partnership capital     $ 0      
ASU 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]            
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]            
Revenue $ 0 $ 0        
Impact to consolidated statements of financial condition 0 0        
ASU 2016-18 [Member]            
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]            
Restricted cash 5,893,000,000 5,893,000,000   $ 7,691,000,000 $ 7,186,000,000 $ 8,525,000,000
ASU 2016-02 [Member]            
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]            
Impact to partnership capital $ 0 0        
ASU 2016-02 [Member] | Minimum [Member]            
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]            
Expected lease asset and lease liability   725,000,000        
ASU 2016-02 [Member] | Maximum [Member]            
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]            
Expected lease asset and lease liability   $ 825,000,000