Annual report pursuant to Section 13 and 15(d)

Financing Receivables and Investments - Analysis of Financing Receivables and Investments by Type of Obligor and Credit Quality (Detail)

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Financing Receivables and Investments - Analysis of Financing Receivables and Investments by Type of Obligor and Credit Quality (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Sep. 30, 2012
Financing Receivable, Recorded Investment [Line Items]    
Financing receivables $ 347,800,000  
Investments 91,964,000   
Financing receivables and investments held-for-sale 28,000,000  
Total 467,800,000  
% of Total Portfolio 100.00%  
Average Remaining Balance 14,000,000  
Federal [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivables 229,800,000  
Investments     
Financing receivables and investments held-for-sale 24,800,000  
Total 254,600,000  
% of Total Portfolio 55.00%  
Average Remaining Balance 10,900,000  
State, Local, Institutions [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivables 73,300,000  
Investments     
Financing receivables and investments held-for-sale     
Total 73,300,000  
% of Total Portfolio 16.00%  
Average Remaining Balance 24,400,000  
Commercial Externally Rated [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivables     
Investments 76,900,000  
Financing receivables and investments held-for-sale     
Total 76,900,000  
% of Total Portfolio 16.00%  
Average Remaining Balance 25,600,000  
Commercial Rated Internally [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivables 43,900,000  
Investments     
Financing receivables and investments held-for-sale     
Total 43,900,000  
% of Total Portfolio 9.00%  
Average Remaining Balance 21,900,000  
Commercial Other [Member]
   
Financing Receivable, Recorded Investment [Line Items]    
Financing receivables 800,000  
Investments 15,100,000  
Financing receivables and investments held-for-sale 3,200,000  
Total 19,100,000  
% of Total Portfolio 4.00%  
Average Remaining Balance $ 9,200,000