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Investment Securities - Schedule of Investments in Accordance with Fair Value Measurement (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Class of Security: |  |
Commercial mortgage-backed securities | $ 277,469 | $ 304,045
U.S. Treasury securities [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities |  | 250
Obligations of U.S. government sponsored enterprises [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities | 98,363 | 124,636
Corporate debt securities [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities | 94,974 | 132,862
Foreign corporate debt securities [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities | 18,666 | 27,229
Commercial Mortgage-backed securities [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities | 10,518 | 19,068
Commercial paper [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities | 54,948 |
Fair Value, Inputs, Level 1 [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities | 90,144 | 43,177
Fair Value, Inputs, Level 1 [Member] | U.S. Treasury securities [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities |  | 250
Fair Value, Inputs, Level 1 [Member] | Obligations of U.S. government sponsored enterprises [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities | 11,362 | 42,927
Fair Value, Inputs, Level 1 [Member] | Corporate debt securities [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities | 22,833 |
Fair Value, Inputs, Level 1 [Member] | Foreign corporate debt securities [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities | 1,001 |
Fair Value, Inputs, Level 1 [Member] | Commercial Mortgage-backed securities [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities |  |
Fair Value, Inputs, Level 1 [Member] | Commercial paper [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities | 54,948 |
Fair Value, Inputs, Level 2 [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities | 187,325 | 260,868
Fair Value, Inputs, Level 2 [Member] | Obligations of U.S. government sponsored enterprises [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities | 87,001 | 81,709
Fair Value, Inputs, Level 2 [Member] | Corporate debt securities [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities | 72,141 | 132,862
Fair Value, Inputs, Level 2 [Member] | Foreign corporate debt securities [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities | 17,665 | 27,229
Fair Value, Inputs, Level 2 [Member] | Commercial Mortgage-backed securities [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities | 10,518 | 19,068
Fair Value, Inputs, Level 3 [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities |  |
Fair Value, Inputs, Level 3 [Member] | U.S. Treasury securities [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities |  |
Fair Value, Inputs, Level 3 [Member] | Obligations of U.S. government sponsored enterprises [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities |  |
Fair Value, Inputs, Level 3 [Member] | Corporate debt securities [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities |  |
Fair Value, Inputs, Level 3 [Member] | Foreign corporate debt securities [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities |  |
Fair Value, Inputs, Level 3 [Member] | Commercial Mortgage-backed securities [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities |  |
Fair Value, Inputs, Level 3 [Member] | Commercial paper [Member] |  |
Class of Security: |  |
Commercial mortgage-backed securities |  |

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