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Commitments and Contingencies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Loss Contingencies [Line Items]
Contingent liability	$ 10,000,000
Rental expense	48,000,000	$ 50,000,000	$ 50,000,000
Total future lease commitments	94,000,000
Series of Individually Immaterial Business Acquisitions [Member]
Loss Contingencies [Line Items]
Rental expense	3,000,000	$ 3,000,000	$ 3,000,000
Total future lease commitments	$ 6,000,000
Operating leases, expiry year	2023
Minimum [Member]
Loss Contingencies [Line Items]
Range of reasonably possible losses	$ 0
Maximum [Member]
Loss Contingencies [Line Items]
Range of reasonably possible losses	$ 16,000,000

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- Definition

Operating leases, expiry year.

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No definition available.

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Amount of loss contingency liability.

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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