Significant Accounting Policies and Practices - Additional Information (Detail)		12 Months Ended
	May. 22, 2014	Dec. 31, 2015 USD ($) Installment Policy	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Jun. 27, 2014 USD ($)
Schedule Of Accounting Policies [Line Items]
Restricted cash		$ 13,085,000	$ 4,339,000
Number of policies acquired | Policy		32,000
Number of policies renewed | Policy		24,100
Allowance for uncollectible premiums		$ 0	250,000
Bad debt expense (recovery), uncollectible premiums		(250,000)	250,000	$ 0
Impairment of long-lived assets		0	0	0
Policy fee		25
Amounts recoverable under reinsurance program		$ 0	$ 0	0
Percentage of earnings		8.50%	8.50%
Accrued bonus to be paid		$ 14,100,000	$ 7,700,000
Bonus paid in cash and equity			$ 7,200,000	$ 11,500,000
Statutory tax rate of current tax law	38.575%	35.00%	35.00%	35.00%
Material tax penalties		$ 0	$ 0	$ 0
Advertising costs		27,000	14,200	$ 393,000
Cash deposits in excess of FDIC insurance limits		243,700,000	$ 154,400,000
Deposits held		$ 250,000
Building [Member]
Schedule Of Accounting Policies [Line Items]
Property plant and equipment useful life		40 years
Computer Hardware and Software [Member]
Schedule Of Accounting Policies [Line Items]
Property plant and equipment useful life		3 years
Minimum [Member]
Schedule Of Accounting Policies [Line Items]
Allowance for credit losses for amounts outstanding, term		90 days
Tax benefit likelihood percentage		50.00%
Minimum [Member] | Office and Furniture Equipment [Member]
Schedule Of Accounting Policies [Line Items]
Property plant and equipment useful life		3 years
Maximum [Member] | Office and Furniture Equipment [Member]
Schedule Of Accounting Policies [Line Items]
Property plant and equipment useful life		7 years
Sunshine State Insurance Company [Member]
Schedule Of Accounting Policies [Line Items]
Policies in force assumed					$ 58,900,000
Annualized premium		$ 53,300,000
Policies in force assumed, percentage		7.00%
Heritage Property and Casualty Insurance Company [Member]
Schedule Of Accounting Policies [Line Items]
Restricted cash		$ 13,100,000
Number of installments to deposit | Installment		2