Fresh Start Accounting - Assets and Liabilities at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 19, 2012
Investments held in trust, at fair value:
Fixed-maturity securities, Predecessor	$ 303,169
Cash equivalents held in trust, Predecessor	26,249
Total investments held in trust, Predecessor	329,418
Fixed-maturity securities, Successor	303,169
Cash equivalents held in trust, Successor	26,249
Total investments held in trust, Successor	329,418
Cash and cash equivalents, Predecessor	7,014
Fixed-maturity securities, at fair value, Predecessor	6,049
Accrued investment income, Predecessor	2,313
Other assets, Predecessor	3,389
Total assets, Predecessor	348,183
Liabilities:
Losses and loss adjustment reserves, Predecessor	141,010
Losses payable, Predecessor	7,585
Unearned premiums, Predecessor	409
Accrued ceding commissions, Predecessor	466
Other liabilities, Predecessor	27,156
Total liabilities, Predecessor	176,626
Notes payable-principal, Reorganization Adjustments	130,000
Other liabilities, Reorganization Adjustments	(23,109)
Total liabilities, Reorganization Adjustments	106,891
Loss contract fair market value reserve, Fair Value Adjustments	63,064
Other liabilities, Fair Value Adjustments	2
Total liabilities, Fair Value Adjustments	63,066
Notes payable, Successor	130,000
Losses and loss adjustment reserves, Successor	141,010
Losses payable, Successor	7,585
Unearned premiums, Successor	409
Accrued ceding commissions, Successor	466
Loss contract fair market value reserve, Successor	63,064
Other liabilities, Successor	4,049
Total liabilities, Successor	346,583
Shareholders' equity:
Common stock, Predecessor	1
Additional paid-in capital, Predecessor	69,879
Retained earnings, Predecessor	101,677
Total shareholders' equity, Predecessor	171,557
Total liabilities and shareholders' equity, Predecessor	348,183
Common stock, Reorganization Adjustments	2
Additional paid-in capital, Reorganization Adjustments	154,998
Retained earnings, Reorganization Adjustments	23,109
Total shareholders' equity, Reorganization Adjustments	178,109
Total liabilities and shareholders' equity, Reorganization Adjustments	285,000
Common stock, Fair Value Adjustments	(1)
Additional paid-in capital (Predecessor), Fair Value Adjustments	(69,879)
Additional paid-in capital (Successor), Fair Value Adjustments	(78,400)
Retained earnings, Fair Value Adjustments	(124,786)
Total shareholders' equity, Fair Value Adjustments	(273,066)
Total liabilities and shareholders' equity, Fair Value Adjustments	(210,000)
Postconfirmation, Common Stock	2
Postconfirmation, Additional Paid-in Capital	76,598
Total shareholders' equity, successor	76,600
Total liabilities and shareholders' equity, Successor	423,183
Cash and cash equivalents, Reorganization Adjustments	75,000
Other assets, Reorganization Adjustments	210,000
Total assets, Reorganization Adjustments	285,000
Liabilities:
Losses and loss adjustment reserves, Predecessor	141,010
Losses payable, Predecessor	7,585
Unearned premiums, Predecessor	409
Accrued ceding commissions, Predecessor	466
Other liabilities, Predecessor	27,156
Total liabilities, Predecessor	176,626
Notes payable-principal, Reorganization Adjustments	130,000
Other liabilities, Reorganization Adjustments	(23,109)
Total liabilities, Reorganization Adjustments	106,891
Loss contract fair market value reserve, Fair Value Adjustments	63,064
Other liabilities, Fair Value Adjustments	2
Total liabilities, Fair Value Adjustments	63,066
Notes payable, Successor	130,000
Losses and loss adjustment reserves, Successor	141,010
Losses payable, Successor	7,585
Unearned premiums, Successor	409
Accrued ceding commissions, Successor	466
Loss contract fair market value reserve, Successor	63,064
Other liabilities, Successor	4,049
Total liabilities, Successor	346,583
Shareholders' equity:
Common stock, Predecessor	1
Additional paid-in capital, Predecessor	69,879
Retained earnings, Predecessor	101,677
Total shareholders' equity, Predecessor	171,557
Total liabilities and shareholders' equity, Predecessor	348,183
Common stock, Reorganization Adjustments	2
Additional paid-in capital, Reorganization Adjustments	154,998
Retained earnings, Reorganization Adjustments	23,109
Total shareholders' equity, Reorganization Adjustments	178,109
Total liabilities and shareholders' equity, Reorganization Adjustments	285,000
Common stock, Fair Value Adjustments	(1)
Additional paid-in capital (Predecessor), Fair Value Adjustments	(69,879)
Additional paid-in capital (Successor), Fair Value Adjustments	(78,400)
Retained earnings, Fair Value Adjustments	(124,786)
Total shareholders' equity, Fair Value Adjustments	(273,066)
Total liabilities and shareholders' equity, Fair Value Adjustments	(210,000)
Postconfirmation, Common Stock	2
Postconfirmation, Additional Paid-in Capital	76,598
Total shareholders' equity, successor	76,600
Total liabilities and shareholders' equity, Successor	423,183
Other assets, Fair Value Adjustments	(210,000)
Total assets, Fair Value Adjustments	(210,000)
Liabilities:
Losses and loss adjustment reserves, Predecessor	141,010
Losses payable, Predecessor	7,585
Unearned premiums, Predecessor	409
Accrued ceding commissions, Predecessor	466
Other liabilities, Predecessor	27,156
Total liabilities, Predecessor	176,626
Notes payable-principal, Reorganization Adjustments	130,000
Other liabilities, Reorganization Adjustments	(23,109)
Total liabilities, Reorganization Adjustments	106,891
Loss contract fair market value reserve, Fair Value Adjustments	63,064
Other liabilities, Fair Value Adjustments	2
Total liabilities, Fair Value Adjustments	63,066
Notes payable, Successor	130,000
Losses and loss adjustment reserves, Successor	141,010
Losses payable, Successor	7,585
Unearned premiums, Successor	409
Accrued ceding commissions, Successor	466
Loss contract fair market value reserve, Successor	63,064
Other liabilities, Successor	4,049
Total liabilities, Successor	346,583
Shareholders' equity:
Common stock, Predecessor	1
Additional paid-in capital, Predecessor	69,879
Retained earnings, Predecessor	101,677
Total shareholders' equity, Predecessor	171,557
Total liabilities and shareholders' equity, Predecessor	348,183
Common stock, Reorganization Adjustments	2
Additional paid-in capital, Reorganization Adjustments	154,998
Retained earnings, Reorganization Adjustments	23,109
Total shareholders' equity, Reorganization Adjustments	178,109
Total liabilities and shareholders' equity, Reorganization Adjustments	285,000
Common stock, Fair Value Adjustments	(1)
Additional paid-in capital (Predecessor), Fair Value Adjustments	(69,879)
Additional paid-in capital (Successor), Fair Value Adjustments	(78,400)
Retained earnings, Fair Value Adjustments	(124,786)
Total shareholders' equity, Fair Value Adjustments	(273,066)
Total liabilities and shareholders' equity, Fair Value Adjustments	(210,000)
Postconfirmation, Common Stock	2
Postconfirmation, Additional Paid-in Capital	76,598
Total shareholders' equity, successor	76,600
Total liabilities and shareholders' equity, Successor	423,183
Investments held in trust, at fair value:
Fixed-maturity securities, Predecessor	303,169
Cash equivalents held in trust, Predecessor	26,249
Total investments held in trust, Predecessor	329,418
Fixed-maturity securities, Successor	303,169
Cash equivalents held in trust, Successor	26,249
Total investments held in trust, Successor	329,418
Cash and cash equivalents, Successor	82,014
Fixed-maturity securities, at fair value, Successor	6,049
Accrued investment income, Successor	2,313
Other assets, Successor	3,389
Total assets, Successor	423,183
Liabilities:
Losses and loss adjustment reserves, Predecessor	141,010
Losses payable, Predecessor	7,585
Unearned premiums, Predecessor	409
Accrued ceding commissions, Predecessor	466
Other liabilities, Predecessor	27,156
Total liabilities, Predecessor	176,626
Notes payable-principal, Reorganization Adjustments	130,000
Other liabilities, Reorganization Adjustments	(23,109)
Total liabilities, Reorganization Adjustments	106,891
Loss contract fair market value reserve, Fair Value Adjustments	63,064
Other liabilities, Fair Value Adjustments	2
Total liabilities, Fair Value Adjustments	63,066
Notes payable, Successor	130,000
Losses and loss adjustment reserves, Successor	141,010
Losses payable, Successor	7,585
Unearned premiums, Successor	409
Accrued ceding commissions, Successor	466
Loss contract fair market value reserve, Successor	63,064
Other liabilities, Successor	4,049
Total liabilities, Successor	346,583
Shareholders' equity:
Common stock, Predecessor	1
Additional paid-in capital, Predecessor	69,879
Retained earnings, Predecessor	101,677
Total shareholders' equity, Predecessor	171,557
Total liabilities and shareholders' equity, Predecessor	348,183
Common stock, Reorganization Adjustments	2
Additional paid-in capital, Reorganization Adjustments	154,998
Retained earnings, Reorganization Adjustments	23,109
Total shareholders' equity, Reorganization Adjustments	178,109
Total liabilities and shareholders' equity, Reorganization Adjustments	285,000
Common stock, Fair Value Adjustments	(1)
Additional paid-in capital (Predecessor), Fair Value Adjustments	(69,879)
Additional paid-in capital (Successor), Fair Value Adjustments	(78,400)
Retained earnings, Fair Value Adjustments	(124,786)
Total shareholders' equity, Fair Value Adjustments	(273,066)
Total liabilities and shareholders' equity, Fair Value Adjustments	(210,000)
Postconfirmation, Common Stock	2
Postconfirmation, Additional Paid-in Capital	76,598
Total shareholders' equity, successor	76,600
Total liabilities and shareholders' equity, Successor	$ 423,183