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Divestiture - Additional Information (Detail) - Community Financial Services Products [Member] - Disposal Group, Not Discontinued Operations [Member] - USD ($) $ in Millions | 12 Months Ended |
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Dec. 31, 2016 | Mar. 03, 2016
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 |
Adjustment to Gain Loss on Sale of Assets [Member] |  |
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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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