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Quarterly financial data - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011
Interim Period, Costs Not Allocable [Line Items] |  |  |  |
Charges related to US Government resolutions | $ 10,500 | $ 46,000 | $ (1,260) | $ 9,520
Previously Reported [Member] |  |  |  |
Interim Period, Costs Not Allocable [Line Items] |  |  |  |
Charges related to US Government resolutions | 10,500 | 46,000 |  |
Adjustments [Member] |  |  |  |
Interim Period, Costs Not Allocable [Line Items] |  |  |  |
Charges related to US Government resolutions | $ 10,500 | $ 46,000 |  |

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- Definition The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to domestic income tax settlements for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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