Related Party Transactions - Additional Information (Detail) - USD ($)	1 Months Ended	9 Months Ended
	Jan. 31, 2017	Sep. 30, 2018	Sep. 30, 2017
Mrs. Shannon Lucas [Member]
Related Party Transaction [Line Items]
Consulting fees hourly rate	$ 400
Immediate Family Member of Management or Principal Owner [Member]
Related Party Transaction [Line Items]
Consulting fees		$ 575,200	$ 371,000
Heritage P&C and NBIC [Member] | Director [Member]
Related Party Transaction [Line Items]
Director annual compensation	$ 150,000