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Summary of Insurance Enhanced Municipal Bonds Backed by Financial Guarantors (Detail) $ in Thousands	Jun. 30, 2015 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	$ 17,454
Ambac Financial Group
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	1,688
Assured Guaranty Corporation
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	3,692
Municipal Bond Insurance Association
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	5,159
Gov't National Housing Association
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	552
Financial Guarantors
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	11,091
Other Credit Enhanced Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	6,363
Pre-Refunded Securities
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	6,501
Pre-Refunded Securities | Ambac Financial Group
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	138
Pre-Refunded Securities | Financial Guarantors
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	138
Pre-Refunded Securities | Other Credit Enhanced Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	6,363
Government Guaranteed Securities
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	552
Government Guaranteed Securities | Gov't National Housing Association
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	552
Government Guaranteed Securities | Financial Guarantors
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	552
Exposure Net Of Pre-refunded & Government Guaranteed Securities
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	10,401
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	1,550
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	3,692
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	5,159
Exposure Net Of Pre-refunded & Government Guaranteed Securities | Financial Guarantors
Schedule of Available-for-sale Securities [Line Items]
Investments in insurance enhanced municipal bonds	$ 10,401

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