Annual report pursuant to Section 13 and 15(d)

Selected Quarterly Financial Data (Unaudited) - Schedule of Quarterly Financial Information (Parenthetical) (Detail)

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Selected Quarterly Financial Data (Unaudited) - Schedule of Quarterly Financial Information (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2012
Schedule Of Quarterly Financial Data [Line Items]    
Reduction of OFAC penalties and fines $ 0.6 $ 0.9