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Notes Payable and Credit Facility - Additional Information (Detail) - USD ($)
Jul. 26, 2013
Jul. 15, 2013
Jul. 11, 2013
Debt Instrument [Line Items]      
Current borrowing capacity $ 100,000,000.0    
Expiration period 5 years    
Maximum borrowing capacity under credit facility $ 150,000,000.0    
Senior Notes      
Debt Instrument [Line Items]      
Debt instrument, issued   $ 100,000,000.0  
Debt instrument redemption price paid   $ 103,000,000  
Federal Home Loan Bank of Cincinnati      
Debt Instrument [Line Items]      
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances     $ 85,000,000
Federal home loan bank advances long-term, duration     20 years
Federal home loan bank advances, long-term non-callable period     3 years
Federal home loan Bank, advances, general debt obligations, disclosures, repayment and penalties     $ 0
Federal home loan bank, advances, branch of FHLB Bank, interest rate (percent)     5.03%