Annual report pursuant to Section 13 and 15(d)

Fair Value Measurement - Fair Value of Company's Fixed Rate Senior Notes and Junior Subordinated Debentures (Detail)

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Fair Value Measurement - Fair Value of Company's Fixed Rate Senior Notes and Junior Subordinated Debentures (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
10.875% Senior Notes [Member] | Carrying Amount [Member]
   
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
10.875% Senior Notes $ 272,942 $ 204,248
Junior Subordinated Debentures [Member] | Carrying Amount [Member]
   
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
10.875% Senior Notes 115,132 115,411
Estimated Fair Value [Member] | 10.875% Senior Notes [Member]
   
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
10.875% Senior Notes 283,881 197,250
Estimated Fair Value [Member] | Junior Subordinated Debentures [Member]
   
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
10.875% Senior Notes $ 128,949 $ 129,371