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Principles of Consolidation and Basis of Presentation - Additional Information (Detail)
$ in Thousands
 3 Months Ended
Jan. 01, 2018
USD ($)
Mar. 31, 2018
USD ($)
Segment
Product
Mar. 31, 2017
USD ($)
Organization And Basis Of Presentation [Line Items]      
Date of incorporation   Feb. 09, 2016  
State of incorporation   Cayman Islands  
Kind of listing   A ordinary shares  
Number of business segments | Segment   3  
Unrealized gains and losses recognized during the reporting period on equity securities   $ (4,928)  
Net cash flows from operating activities increase (decrease)   41,227 $ (13,602)
Net cash flows from investing activities increase (decrease)   (28,595) (66,105)
Restatement Adjustment      
Organization And Basis Of Presentation [Line Items]      
Net cash flows from operating activities increase (decrease)     1,700
Net cash flows from investing activities increase (decrease)     $ (1,700)
Accounting Standards Update 2016-01      
Organization And Basis Of Presentation [Line Items]      
Cumulative effect adjustment, net of tax $ 10,000    
Unrealized gains and losses recognized during the reporting period on equity securities   $ (4,928)  
Commercial Lines Segment      
Organization And Basis Of Presentation [Line Items]      
Number of product classifications | Product   4