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Divestiture - Additional information (Detail) - Community Financial Services products - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Mar. 03, 2016
TSA | Maximum |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Migration period | 18 months |
Disposal Group, Not Discontinued Operations |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Amount of consideration related to disposal |  | $ 200.0
Net after-tax gain on the sale of assets | $ 93.4 |
Disposal Group, Not Discontinued Operations | Adjustment to Gain Loss on Sale of Assets |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Net after-tax gain on the sale of assets | $ 0.5 |

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- Definition Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation. + References No definition available. + Details
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- Definition Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value. + References No definition available. + Details
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