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Discontinued Operations and Divestitures - Additional Information (Detail)	1 Months Ended	3 Months Ended		9 Months Ended
	Dec. 31, 2014 Office	Sep. 30, 2016 Office	Sep. 30, 2015 Business	Sep. 30, 2016 Office	Sep. 30, 2015 Business
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of business divestiture		0		0
Financial Services [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Number of business divestiture	2
Number of businesses sold | Business			2		2

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