Goodwill and Intangible Assets - Summary of Analysis of Goodwill by Reporting Segment (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Goodwill [Line Items]
Goodwill at Beginning of the Period	$ 4,460
Goodwill Acquired	11,312
Foreign Currency Translation Adjustment	(27)
Goodwill at End of the Period	15,745
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	11,312
Foreign Currency Translation Adjustment	(27)
Goodwill at End of the Period	$ 13,767