Fair Value Measurements - Summarizes Carrying Value and Estimated Fair Values of Financial Instruments not Carried at Fair Value (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Surplus Note [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Carrying value	$ 16,176	$ 17,280
Surplus Note [Member] | Level 3 [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Estimated Fair Value	14,246	14,951
Term Loan [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Carrying value	6,758	13,330
Term Loan [Member] | Level 3 [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Estimated Fair Value	6,758	$ 13,330
Promissory Note [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Carrying value	1,390
Promissory Note [Member] | Level 3 [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items]
Estimated Fair Value	$ 1,390