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Business Combination - Summary of Fair Value of Intangible Assets (Parenthetical) (Detail) - Acquisition of ETFS Business [Member]
Nov. 30, 2019
Apr. 11, 2018
Business Acquisition [Line Items]    
Weighted average cost of capital percentage 10.00% 11.60%
Minimum [Member]    
Business Acquisition [Line Items]    
Revenue growth percentage 3.00% 3.00%
Maximum [Member]    
Business Acquisition [Line Items]    
Revenue growth percentage 9.00% 4.00%