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Debt - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |  |  |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |  |  |  | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |
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Jul. 31, 2010 | Sep. 30, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Convertible Common Stock [Member] | Mar. 31, 2012 7.625% Contingent Convertible Senior Notes due 2027 [Member] | Nov. 30, 2011 7.625% Contingent Convertible Senior Notes due 2027 [Member] | Oct. 31, 2011 7.625% Contingent Convertible Senior Notes due 2027 [Member] | Dec. 31, 2012 7.625% Contingent Convertible Senior Notes due 2027 [Member] | Dec. 31, 2010 7.625% Contingent Convertible Senior Notes due 2027 [Member] | Jul. 05, 2012 7.625% Contingent Convertible Senior Notes due 2027 [Member] | Dec. 31, 2011 7.625% Contingent Convertible Senior Notes due 2027 [Member] | Jul. 31, 2011 7.625% Contingent Convertible Senior Notes due 2027 [Member] | Dec. 16, 2009 7.625% Contingent Convertible Senior Notes due 2027 [Member] | Jul. 31, 2011 10.50% Contingent Convertible Senior Notes due 2027 [Member] | Jun. 20, 2011 10.50% Contingent Convertible Senior Notes due 2027 [Member] | Dec. 31, 2011 10.50% Contingent Convertible Senior Notes due 2027 [Member] | Dec. 31, 2012 10.50% Contingent Convertible Senior Notes due 2027 [Member] | Sep. 30, 2012 Subordinated Notes [Member] | Aug. 27, 2010 Subordinated Notes [Member] | Jul. 29, 2010 Subordinated Notes [Member] | Dec. 31, 2012 Subordinated Notes [Member] | Dec. 31, 2010 Subordinated Notes [Member] | Dec. 31, 2011 Subordinated Notes [Member] | Dec. 31, 2012 Junior subordinated notes [Member] | Dec. 31, 2011 Junior subordinated notes [Member] | Dec. 31, 2012 Junior subordinated notes [Member] Sunset Financial Statutory Trust I [Member] | Dec. 31, 2011 Junior subordinated notes [Member] Sunset Financial Statutory Trust I [Member] | Jun. 30, 2007 Junior subordinated notes [Member] Alesco Capital Trust I [Member] | Dec. 31, 2012 Junior subordinated notes [Member] Alesco Capital Trust I [Member] | Dec. 31, 2011 Junior subordinated notes [Member] Alesco Capital Trust I [Member] | Dec. 31, 2012 March Thirty First Two Thousand Five Junior Subordinated Notes [Member] Sunset Financial Statutory Trust I [Member] | Dec. 31, 2012 PrinceRidge [Member] | May 15, 2012 Senior notes [Member] 7.625% Contingent Convertible Senior Notes due 2027 [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of Contingent Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,621 | $ 26,150 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate of debt |  |  |  |  |  |  |  |  |  | 7.625% |  |  |  |  |  |  | 10.50% |  | 10.50% |  |  |  | 12.00% |  |  |  |  |  |  |  |  |  |  |  |
Maturity year of senior notes |  |  |  |  |  |  |  |  |  | 2027 |  |  |  |  |  |  |  |  | 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of repurchase of debt |  |  |  |  |  |  | 150 | 1,025 |  |  | 6,644 |  |  |  |  |  |  |  |  | 1,177 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of debt repurchased |  |  |  |  |  |  | 151 | 988 |  |  | 5,596 |  |  |  |  |  |  |  |  | 1,139 | 6,762 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain from repurchase of debt |  |  | 86 | 33 | 2,555 |  | 3 | 33 |  |  | 923 |  |  |  |  |  |  |  |  | 83 |  |  |  | 1,632 |  |  |  |  |  |  |  |  |  |  |
Exchange Offer expired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 19, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of the principal amount of the Old Notes outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  | 39.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  | 9,300 |  |  |  |  |  |  |  |  |  |  | 7,621 |  | 8,121 |  |  |  |  |  |  |  |  |  |  |  | 28,995 |  |  | 20,619 |  |
Negotiated exchange of principal balance of Old Notes |  |  |  |  |  |  |  |  | 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued interest |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt (before deducting unamortized discount or premiums (if any)) redeemed |  |  |  |  |  |  |  |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,110
Aggregate principal amount of old note |  |  |  |  |  |  |  |  |  | 0 |  |  | 10,360 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of debt |  |  |  |  |  |  |  |  |  | 0 |  |  | 10,303 |  |  |  |  | 8,030 | 8,068 |  |  |  | 342 |  | 1,491 |  |  | 7,248 | 6,939 |  | 10,189 | 10,404 |  |  |
Interest payment terms on contingent convertible notes |  |  |  |  |  |  |  |  |  | payable semiannually on May 15 and November 15 of each year |  |  |  |  |  |  |  |  | Payable semiannually on May 15 and November 15 of each year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of principal amount of New Notes at redemption price |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion rate per share of common stock |  |  |  |  |  | $ 116.37 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares exchanged for notes due to conversion |  |  |  |  |  | 8.5933 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Par value of notes converted |  |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of junior subordinated notes outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49,614 |  |  |  |  |  |  |  |  |
Carrying value of junior subordinated notes outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,437 | 17,343 |  |  |  |  |  |  |  |
Aggregate date issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Mar. 31, 2005 |  |  | Jun. 30, 2007 |  |  |  |
Maturity date of notes |  |  | Dec. 21, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 20, 2013 |  |  |  |  | Mar. 30, 2035 |  |  | Jul. 30, 2037 |  |  |  |
Notes interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.495% |  |  |  |
Interest rate basis for effective rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90-day LIBOR plus 415 basis points |  |  | On July 30, 2012 and thereafter at a floating interest rate equal to LIBOR plus 400 basis points per annum through July 30, 2037 |  |  |  |
Shares of common securities of VIE Trusts issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 619 |  |  | 870 |  |  |  |
Purchase price of common securities of VIE Trusts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 619 |  |  | 870 |  |  |  |
Deemed fair value of common securities of VIE Trusts |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate for subordinated notes, cash portion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9.00% |  |  |  |  |  |  |  |  |  |  |  |
Interest rate date of first semiannual payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | May 1 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate date of second semiannual payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | November 1 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate of notes payable, paid in kind semiannually |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |
Percentage of accrued interest on increased principal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.00% |  |  |  |  |  |  |  |  |  |  |  |
Debt offering date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 29, 2010 |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balance of Subordinated Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,081 | 9,508 |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of outstanding subordinated notes repurchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85.00% | 85.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued cash and in-kind interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of redeemable equity interests |  |  | 2,640 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,640 |
Promissory notes in initial aggregate principal amount |  |  | 4,824 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest accrued on unpaid principal balance |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term loan capacity | 9,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of letters of credit | 1,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum annual interest rate | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Paid fee on face amount of letter of credit |  |  | 4.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fronting fee on face amount of letter of credit |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront fee for Former Bank Loan |  | 250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exit fee for previous credit facility |  | 450 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized deferred financing costs to interest expense |  |  |  | 134 | 675 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred financing cost |  |  |  |  | 349 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense from deferred financing cost |  |  | $ 0 | $ 282 | $ 1,111 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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