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Summary of Insurance Enhanced Municipal Bonds Backed by Financial Guarantors (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Schedule of Available-for-sale Securities [Line Items]  
Investments in insurance enhanced municipal bonds $ 14,619
Ambac Financial Group
  
Schedule of Available-for-sale Securities [Line Items]  
Investments in insurance enhanced municipal bonds 1,263
Assured Guaranty Corporation
  
Schedule of Available-for-sale Securities [Line Items]  
Investments in insurance enhanced municipal bonds 6,095
Municipal Bond Insurance Association
  
Schedule of Available-for-sale Securities [Line Items]  
Investments in insurance enhanced municipal bonds 3,686
Gov't National Housing Association
  
Schedule of Available-for-sale Securities [Line Items]  
Investments in insurance enhanced municipal bonds 601
Permanent School Fund Guaranty
  
Schedule of Available-for-sale Securities [Line Items]  
Investments in insurance enhanced municipal bonds 1,258
Financial Guarantors
  
Schedule of Available-for-sale Securities [Line Items]  
Investments in insurance enhanced municipal bonds 12,903
Other Credit Enhanced Municipal Bonds
  
Schedule of Available-for-sale Securities [Line Items]  
Investments in insurance enhanced municipal bonds 1,716
Pre-Refunded Securities
  
Schedule of Available-for-sale Securities [Line Items]  
Investments in insurance enhanced municipal bonds 1,859
Pre-Refunded Securities | Ambac Financial Group
  
Schedule of Available-for-sale Securities [Line Items]  
Investments in insurance enhanced municipal bonds 143
Pre-Refunded Securities | Financial Guarantors
  
Schedule of Available-for-sale Securities [Line Items]  
Investments in insurance enhanced municipal bonds 143
Pre-Refunded Securities | Other Credit Enhanced Municipal Bonds
  
Schedule of Available-for-sale Securities [Line Items]  
Investments in insurance enhanced municipal bonds 1,716
Government Guaranteed Securities
  
Schedule of Available-for-sale Securities [Line Items]  
Investments in insurance enhanced municipal bonds 1,859
Government Guaranteed Securities | Gov't National Housing Association
  
Schedule of Available-for-sale Securities [Line Items]  
Investments in insurance enhanced municipal bonds 601
Government Guaranteed Securities | Permanent School Fund Guaranty
  
Schedule of Available-for-sale Securities [Line Items]  
Investments in insurance enhanced municipal bonds 1,258
Government Guaranteed Securities | Financial Guarantors
  
Schedule of Available-for-sale Securities [Line Items]  
Investments in insurance enhanced municipal bonds 1,859
Exposure Net Of Pre-refunded & Government Guaranteed Securities
  
Schedule of Available-for-sale Securities [Line Items]  
Investments in insurance enhanced municipal bonds 10,901
Exposure Net Of Pre-refunded & Government Guaranteed Securities | Ambac Financial Group
  
Schedule of Available-for-sale Securities [Line Items]  
Investments in insurance enhanced municipal bonds 1,120
Exposure Net Of Pre-refunded & Government Guaranteed Securities | Assured Guaranty Corporation
  
Schedule of Available-for-sale Securities [Line Items]  
Investments in insurance enhanced municipal bonds 6,095
Exposure Net Of Pre-refunded & Government Guaranteed Securities | Municipal Bond Insurance Association
  
Schedule of Available-for-sale Securities [Line Items]  
Investments in insurance enhanced municipal bonds 3,686
Exposure Net Of Pre-refunded & Government Guaranteed Securities | Financial Guarantors
  
Schedule of Available-for-sale Securities [Line Items]  
Investments in insurance enhanced municipal bonds $ 10,901