Acquisitions - Additional Information (Detail)		3 Months Ended	12 Months Ended
	Jun. 01, 2016 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) Acquisition	May 31, 2017 USD ($)
Business Acquisition [Line Items]
Goodwill			$ 328,000,000	$ 311,000,000	$ 205,000,000
Amortization of Intangible Assets			$ 22,000,000	21,000,000	13,000,000
Acquisition related costs					6,000,000
Aggregate working capital adjustment					6,000,000
Revenues from business acquisition					341,000,000
Net loss from business acquisition					171,000,000
Maximum [Member] | Warehousing, Selling and Administrative [Member]
Business Acquisition [Line Items]
Recognized gain on acquisition				1,000,000
2016 Acquisition [Member]
Business Acquisition [Line Items]
Purchase price consideration	$ 179,000,000	$ 179,000,000
Goodwill						$ 119,000,000
Intangible assets						$ 45,000,000
Acquisition related costs				2,000,000
2016 Acquisition [Member] | Non-Compete [Member]
Business Acquisition [Line Items]
Intangible assets				$ 7,000,000
Intangible assets amortization period				2 years
Amortization of Intangible Assets				$ 2,000,000
Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Purchase price consideration					515,000,000
Goodwill					276,000,000
Intangible assets					$ 103,000,000
Number of acquisitions completed | Acquisition					8
Purchase price consideration in cash					$ 544,000,000
Business Acquisition Acquiree One [Member]
Business Acquisition [Line Items]
Business acquisition, maximum contingent consideration payments					6,000,000
Business acquisition, fair value of contingent consideration payments as of acquisition date					$ 4,000,000