Acquisitions and Divestitures - Additional Information (Detail) $ / shares in Units, $ in Thousands				2 Months Ended	12 Months Ended
	Sep. 14, 2018 USD ($)	Nov. 02, 2017 USD ($)	Apr. 03, 2017 USD ($) Location	Dec. 31, 2017 USD ($) $ / shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) Location Business $ / shares	Dec. 31, 2017 USD ($) Business $ / shares	Dec. 31, 2016 USD ($) Business $ / shares
Business Acquisition [Line Items]
Cash paid for acquisition						$ 283,000	$ 1,457,000	$ 420,000
Goodwill and intangible assets acquired						167,000	1,926,000	260,000
Payment for debt extinguishment or debt prepayment cost						0	833,775	0
Finite-lived intangible assets acquired						164,348	796,544
Net sales						$ 18,735,073	$ 16,308,801	$ 15,339,713
Diluted net income per common share (in dollars per share) | $ / shares						$ 5.50	$ 4.18	$ 4.59
Business Products Group [Member]
Business Acquisition [Line Items]
Proceeds from termination fee	$ 12,000
Grupo Auto Todo [Member]
Business Acquisition [Line Items]
Revenue of disposed business						$ 93,000
Grupo Auto Todo [Member] | Scenario, Forecast [Member]
Business Acquisition [Line Items]
Proceeds from divestiture of businesses					$ 12,000
Business exit costs					$ 30,000
Customer Relationships [Member]
Business Acquisition [Line Items]
Other intangible assets acquired				$ 69,000		$ 76,000	$ 69,000	$ 112,000
Weighted average amortization lives (in years)						15 years	15 years	17 years
Trademarks [Member]
Business Acquisition [Line Items]
Other intangible assets acquired								$ 28,000
Weighted average amortization lives (in years)								35 years
United States [Member]
Business Acquisition [Line Items]
Net sales						$ 13,927,091	$ 13,246,619	$ 12,779,971
2017 Acquisitions [Member]
Business Acquisition [Line Items]
Cash paid for acquisition							$ 1,334,000
Company acquired | Business							15
2016 Acquisitions [Member]
Business Acquisition [Line Items]
Cash paid for acquisition								$ 370,000
Company acquired | Business								19
Alliance Automotive Group [Member]
Business Acquisition [Line Items]
Cash paid for acquisition		$ 1,067,000
Weighted average amortization lives (in years)		20 years
Cash acquired from acquisition		$ 123,000
Payment for debt extinguishment or debt prepayment cost		825,000
Intangible assets		727,000				813,000
Net sales				$ 256,400
Diluted net income per common share (in dollars per share) | $ / shares				$ 0.07
Pro forma revenue							$ 17,627,000	$ 16,575,000
Pro forma earnings per share, diluted (in dollars per share) | $ / shares							$ 4.56	$ 4.55
Alliance Automotive Group [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Finite-lived intangible assets acquired		630,133
Alliance Automotive Group [Member] | Trademarks [Member]
Business Acquisition [Line Items]
Finite-lived intangible assets acquired		$ 181,702
Alliance Automotive Group [Member] | Trademarks [Member] | Minimum [Member]
Business Acquisition [Line Items]
Weighted average amortization lives (in years)		28 years
Alliance Automotive Group [Member] | Trademarks [Member] | Maximum [Member]
Business Acquisition [Line Items]
Weighted average amortization lives (in years)		2 years
Alliance Automotive Group [Member] | Other Intangible Assets [Member]
Business Acquisition [Line Items]
Weighted average amortization lives (in years)		22 years
Finite-lived intangible assets acquired		$ 1,165
Inenco Group [Member]
Business Acquisition [Line Items]
Revenue reported by acquired entity for last annual period			$ 400,000
Percentage of voting interests acquired			35.00%
Payments to acquire equity method investments			$ 72,100
Number of locations of acquired entity | Location			174
Percentage of voting interests with option to be acquired			65.00%
Automotive [Member]
Business Acquisition [Line Items]
Company acquired | Business							12	11
Revenue reported by acquired entity for last annual period						$ 180,000
Automotive [Member] | 2018 Acquisitions [Member]
Business Acquisition [Line Items]
Company acquired | Business						20
Automotive [Member] | TMS Motor Spares [Member] | Scotland [Member]
Business Acquisition [Line Items]
Number of locations | Location						17
Automotive [Member] | TMS Motor Spares [Member] | England [Member]
Business Acquisition [Line Items]
Number of locations | Location						7
Automotive [Member] | Platinum International Group [Member] | United Kingdom [Member]
Business Acquisition [Line Items]
Number of locations | Location						9
Automotive [Member] | Platinum International Group [Member] | Netherlands [Member]
Business Acquisition [Line Items]
Number of locations | Location						1
Industrial [Member]
Business Acquisition [Line Items]
Company acquired | Business							3	6
Revenue reported by acquired entity for last annual period						$ 100,000
Industrial [Member] | 2018 Acquisitions [Member]
Business Acquisition [Line Items]
Company acquired | Business						3
Industrial [Member] | Hydraulic Supply Company [Member] | United States [Member]
Business Acquisition [Line Items]
Number of locations | Location						30
Business Products [Member]
Business Acquisition [Line Items]
Company acquired | Business								2