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Restructuring and Relocation Activities - Additional Information (Detail) $ in Millions		12 Months Ended
	Dec. 31, 2017 USD ($) Job	Dec. 31, 2016 USD ($)
Restructuring Cost And Reserve [Line Items]
Restructuring expected accrual to pay		$ 44.8
Restructuring expected accrual remaining to pay		$ 2.6
FUSION [Member]
Restructuring Cost And Reserve [Line Items]
Jobs relocation completion date		Dec. 31, 2017
Scenario, Forecast [Member] | FUSION [Member]
Restructuring Cost And Reserve [Line Items]
Number of Jobs relocated from Elmwood park to Charlotte | Job	1,300
Scenario, Forecast [Member] | FUSION [Member] | Building Cost Of Charlotte Campus
Restructuring Cost And Reserve [Line Items]
Total estimated net cash cost	$ 120.0

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Date the exit and disposal activities were completed or are expected to be completed, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(a))
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

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Amount expected to be recognized in earnings for the specified restructuring cost.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 420
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