Related Party Transactions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended		0 Months Ended	1 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014 Oxbridge [Member] Directors	Jun. 27, 2013 Moksha [Member]	Jun. 30, 2014 Moksha [Member]	Sep. 30, 2014 Moksha [Member] Directors	Dec. 31, 2013 Claddaugh [Member] Oxbridge [Member] Period from June 1, 2013 through May 31, 2014 [Member]	Sep. 30, 2014 Claddaugh [Member] Oxbridge [Member] Period from June 1, 2014 through May 31, 2015 [Member]	Dec. 31, 2013 Claddaugh [Member] Moksha [Member] Period from June 1, 2013 through May 31, 2014 [Member]	Sep. 30, 2014 HCPCI [Member] Oxbridge [Member]
Related Party Transaction [Line Items]
Assumed total covered exposure						$ 10,100	$ 17,800	$ 15,400	$ 9,000
Premiums paid			4,300			4,900	4,935	4,300	1,350
No. of non-employee directors		3			1
Amount received from retrospective reinsurance contracts	$ 1,485			$ 1,485