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Summary of Insurance Enhanced Municipal Bonds Backed by Financial Guarantors (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014
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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

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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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