Fresh Start Financial Statement Reporting - Schedule of Impact of Fresh Start Adjustments (Parenthetical) (Detail) (USD $)	1 Months Ended	9 Months Ended	12 Months Ended
	Apr. 30, 2013	Sep. 30, 2013	Dec. 31, 2012
Fresh-Start Adjustment [Line Items]
Fair value deferred acquisition costs	$ 0
Percentage of profit margin	17.00%	17.00%	20.00%
Surplus Notes [Member]
Fresh-Start Adjustment [Line Items]
Discount rate	10.60%
Junior Surplus Notes [Member]
Fresh-Start Adjustment [Line Items]
Discount rate	16.60%
Loans (Non-VIE) [Member]
Fresh-Start Adjustment [Line Items]
Principal-weighted average life	6 years 9 months 22 days
Coupon rate	5.01%
Discount rate	9.71%
VIE Loans and Long-Term Debt [Member]
Fresh-Start Adjustment [Line Items]
Discount rate	5.70%
Obligations Under Investment Agreements [Member]
Fresh-Start Adjustment [Line Items]
Discount rate	9.40%