Fair Value Measurements - Fair Value of Company's Fixed Rate Senior Notes and Junior Subordinated Debentures (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
10.875% Senior Notes [Member] | Carrying Value [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt	$ 271,434	$ 271,750
10.875% Senior Notes [Member] | Estimated Fair Value [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt	281,563	285,538
Junior Subordinated Debentures [Member] | Carrying Value [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt	114,891	114,941
Junior Subordinated Debentures [Member] | Estimated Fair Value [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Debt	$ 132,113	$ 131,480