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Goodwill and Intangible Assets - Summary of Analysis of Goodwill by Reporting Segment (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Goodwill [Line Items]  
Goodwill at Beginning of the Period $ 4,460
Goodwill Acquired 12,703
Foreign Currency Translation Adjustment 81
Goodwill at End of the Period 17,244
U.S.Insurance  
Goodwill [Line Items]  
Goodwill at Beginning of the Period 1,978
Goodwill at End of the Period 1,978
International Insurance  
Goodwill [Line Items]  
Goodwill at Beginning of the Period 2,482
Goodwill Acquired 12,703
Foreign Currency Translation Adjustment 81
Goodwill at End of the Period $ 15,266