Related Party Transactions - Schedule of Premium Receivable, Loss Experience Refund Repayable and Unearned Premiums (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Schedule of Other Related Party Transactions [Line Items]
Premiums receivable	$ 6,234	$ 0
Loss experience refund payable	5,080	1,367
Unearned premiums reserve	9,433	2,036
Claddaugh and HCPCI [Member]
Schedule of Other Related Party Transactions [Line Items]
Premiums receivable	501
Loss experience refund payable	3,242	1,367
Unearned premiums reserve	$ 3,380	$ 2,036