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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%

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