Recently Adopted Accounting Standards - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Revenue	$ 2,042,000,000	$ 1,797,000,000
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
Impact to consolidated statements of financial condition	0
ASU 2016-18 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Restricted cash	$ 7,063,000,000	$ 8,370,000,000		$ 7,691,000,000	$ 8,525,000,000