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Discontinued Operations and Divestitures - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) Business	Dec. 31, 2015 USD ($) Business	Dec. 31, 2014 USD ($)
Financial Services [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of businesses sold | Business		2
Aggregate Purchase price consideration paid during transaction		$ 2.7
Gain from the sale of its individual wealth management business		$ 1.4
Benefits And Insurance Services Practice Group [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of businesses sold | Business	2
Gain from the sale of its individual wealth management business	$ 0.9
Financial Services Practice Group [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain from the sale of its individual wealth management business			$ 1.3

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Disposal group business transferred amount under contractual arrangement.

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Gain (loss) from sale or disposal of an organization or integrated set of activities (for example, but not limited to, a partnership or corporation) engaged in providing a product or service in a commercial, industrial, or professional environment.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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