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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Equity in the earnings of a partnership $ 100 $ 1,448  
7.75% Subordinated Notes due 2045      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Subordinated Notes percentage 7.75% 7.75% 7.75%
Subordinated Notes due date   2045 2045
Fair Value, Inputs, Level 1 | 7.75% Subordinated Notes due 2045      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Subordinated Notes percentage 7.75% 7.75%  
Subordinated Notes due date   2045