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Investments - Schedule of Credit Quality of Asset-Based Loan (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Asset-based loans, by credit quality rating  
Total asset-backed loans $ 181,414
Total asset-backed loans, percent 100.00%
Asset-based loans, by credit quality Rating 1 [Member] | Credit Rating AAA/AA/A [Member]
 
Asset-based loans, by credit quality rating  
Total asset-backed loans 75,737
Total asset-backed loans, percent 42.00%
Asset-based loans, by credit quality Rating 2 [Member] | Credit Rating BBB [Member]
 
Asset-based loans, by credit quality rating  
Total asset-backed loans 94,901
Total asset-backed loans, percent 52.00%
Asset-based loans, by credit quality Rating 3 [Member] | Credit Rating B [Member]
 
Asset-based loans, by credit quality rating  
Total asset-backed loans 10,773
Total asset-backed loans, percent 6.00%
Not Rated [Member]
 
Asset-based loans, by credit quality rating  
Total asset-backed loans $ 3