Significant Accounting Policies - Additional Information (Detail) - USD ($) shares in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Feb. 25, 2015	Feb. 10, 2014	May 22, 2012
Significant Accounting Policies [Line Items]
Plan Effective Date	Mar. 19, 2012
Unearned premiums	$ 270,000	$ 761,000
Premium deficiency reserves	300,000	800,000
Other liabilities	14,063,000	14,357,000
Accrued professional fees	1,100,000
Comprehensive income (loss)	0
Amount of dividends paid on or after Effective Date	0
Preferred stock dividends	18,000,000	17,748,000
Preferred stock dividends paid	18,000,000	16,998,000
2012 Plan [Member]
Significant Accounting Policies [Line Items]
Common stock reserved for future issuance			12.0	3.0	2.0
Redeemable Convertible Series B Preferred Stock [Member]
Significant Accounting Policies [Line Items]
Accrued fees	12,300,000
Accrued dividends	700,000
Preferred stock dividends	18,000,000	17,000,000
Additional accrued preferred stock dividends	700,000	700,000
Preferred stock dividends paid	$ 18,000,000	$ 17,000,000
Preferred stock dividend rate	3.00%	3.00%