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Schedule of Investments in Accordance with Fair Value Measurement (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Class of Security: |  |
Commercial mortgage-backed securities | $ 281,294 | $ 304,045
US Treasury Securities [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities | 250 | 250
US Government-sponsored Enterprises Debt Securities [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities | 102,908 | 124,636
Corporate Debt Securities [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities | 102,876 | 132,862
Commercial Paper [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities | 44,915 |
Foreign Corporate Debt Securities [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities | 18,784 | 27,229
Commercial Mortgage Backed Securities [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities | 11,561 | 19,068
Fair Value, Inputs, Level 1 [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities | 61,580 | 43,177
Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities | 250 | 250
Fair Value, Inputs, Level 1 [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities | 16,415 | 42,927
Fair Value, Inputs, Level 1 [Member] | Commercial Paper [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities | 44,915 |
Fair Value, Inputs, Level 2 [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities | 219,714 | 260,868
Fair Value, Inputs, Level 2 [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities | 86,493 | 81,709
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities | 102,876 | 132,862
Fair Value, Inputs, Level 2 [Member] | Foreign Corporate Debt Securities [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities | 18,784 | 27,229
Fair Value, Inputs, Level 2 [Member] | Commercial Mortgage Backed Securities [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities | $ 11,561 | $ 19,068

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