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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | |
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Mar. 31, 2013
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Dec. 31, 2012
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Minimum [Member]
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| Commitments and Contingencies Disclosure [Line Items] | ||
| Data Processing, Outsourcing Services And Other Agreements, expiration year | 2013 | |
| Data Processing, Outsourcing Services And Other Agreements, estimated aggregate contractual obligation | $ 40 | |
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Maximum [Member]
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| Commitments and Contingencies Disclosure [Line Items] | ||
| Data Processing, Outsourcing Services And Other Agreements, expiration year | 2018 | |
| Data Processing, Outsourcing Services And Other Agreements, estimated aggregate contractual obligation | 70 | |
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Bvs Commitment [Member]
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| Commitments and Contingencies Disclosure [Line Items] | ||
| Maximum Committed Borrowing Capacity | $ 55 | |
| Commitment Maturity Date | May 31, 2015 |