Employee Benefit Plans - Additional Information (Detail) - Defined Benefit Pension Plans - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Estimated Decrease in Pension Expense for 2017 due to change of method used to estimate service cost and interest cost components of pension expense from a single weighted-average method to an individual spot rate approach	$ 15.0
Contribution to pension plans	$ 4.9	$ 5.1

The amount of cash or cash equivalents contributed by the entity to fund its pension plans.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585

Name:	us-gaap_PensionContributions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration