Reinsurance and Loss and Loss Adjustment Expenses - Effects of Reinsurance on Premiums Written and Earned (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Policyholders Account In Life Insurance Business [Abstract]
Written, Direct premiums	$ 315,568
Written, Assumed premiums	1
Written, Ceded premiums	315,563
Written, Net premiums	6
Earned, Direct premiums	258,489
Earned, Assumed premiums	157
Earned, Ceded premiums	258,640
Earned, Net premiums	$ 6