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Business Combinations and Noncontrolling Interest - Additional Information (Detail) - USD ($) $ in Millions		9 Months Ended		12 Months Ended
	Mar. 01, 2016	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Business Combinations [Line Items]
Non-controlling interest	$ 39.2			$ 37.8	$ 38.7
Net assets acquired	$ 2.1
Number of Class B shares exchanged	10,063,749
Cash acquired	$ 1.2
Net wokring capital acquired	0.9
Goodwill related to the acquisition price	$ 37.1
Net loss attributable to noncontrolling interest		$ (0.5)	$ (0.4)	(1.3)	0.1
Non-controlling Interest
Business Combinations [Line Items]
Net loss attributable to noncontrolling interest				$ 1.3	$ 0.1

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Business Acquisition Net Working Capital Assets Acquired

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Business Combinations [Line Items]

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Number of shares of equity interests issued or issuable to acquire entity.

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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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Amount of Net Income (Loss) attributable to noncontrolling interest.

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