Insurance Activity - Additional Information (Detail) (USD $)	0 Months Ended		9 Months Ended
	Jul. 15, 2014	Jul. 01, 2014	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Aug. 31, 2009
Effects of Reinsurance [Line Items]
Restricted cash	$ 16,200,000	$ 62,700,000
Restricted cash used to pay principal amount	257,000	679,000
Quoted percentage to share base						50.00%
Balances in the fair market reserve			16,000,000		46,300,000
Decreased value of fair market reserve			30,300,000	1,000,000
Decrease in expense			30,300,000	1,000,000
First Lien Runoff Notes [Member]
Effects of Reinsurance [Line Items]
Remaining outstanding balance amount	2,900,000
Second Lien Runoff Notes [Member]
Effects of Reinsurance [Line Items]
Remaining outstanding balance amount	26,500,000
United Guaranty [Member]
Effects of Reinsurance [Line Items]
Amount paid by UGRIC			17,700,000
WMMRC [Member]
Effects of Reinsurance [Line Items]
Amount paid by UGRIC			$ 65,400,000
Second loss layer risk percentage of range minimum						5.00%
Second loss layer risk percentage of range maximum						10.00%
First loss layer risk percentage of range minimum						4.00%
First loss layer risk percentage of range maximum						5.00%
Minimum period of reinsurance agreements			5 years
Maximum period of reinsurance agreements			10 years
WMMRC [Member] | Minimum [Member]
Effects of Reinsurance [Line Items]
Net of ceding commission, percentage						25.00%
WMMRC [Member] | Maximum [Member]
Effects of Reinsurance [Line Items]
Net of ceding commission, percentage						40.00%