Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Nature of Business and Basis of Presentation - Additional Information (Detail)

v3.10.0.1
Nature of Business and Basis of Presentation - Additional Information (Detail) - Segment
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Number of Operating segments 2    
Percentage Of consolidated assets, net revenues And net income reported by reportable operating segment 100.00% 100.00% 100.00%