Summary of Significant Accounting Policies - Additional Information (Detail) $ / shares in Units, shares in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) Location $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Jan. 01, 2019 USD ($)	Jan. 01, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of locations | Location	3,100
Provisions for doubtful accounts	$ 17,147,000	$ 13,932,000	$ 11,515,000
Allowance for doubtful accounts receivable	21,888,000	17,612,000
Excess of FIFO costs over stated LIFO value	479,500,000	440,550,000
Reduction in cost of goods sold by the effect of LIFO liquidations	0	2,000,000	6,000,000
Merchandise inventory	233,192,000	203,589,000
Impairment of goodwill	0	0	0
Fair value of fixed rate debt	1,427,381,000	1,497,179,000
Long-term debt	1,466,803,000	1,506,400,000
Advertising costs	204,700,000	166,000,000	153,100,000
Cost of goods sold	$ 12,751,286,000	$ 11,402,403,000	$ 10,740,106,000
Outstanding options to purchase common shares not included in dilutive share (in shares) | shares	1,490	1,920	1,290
Exercise price range, lower range limit (in dollars per share) | $ / shares	$ 85	$ 85	$ 85
Exercise price range, upper range limit (in dollars per share) | $ / shares	$ 100	$ 85	$ 85
Cumulative effect of new accounting principle in period of adoption					$ (5,843,000)
Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle in period of adoption					$ (5,843,000)
Accounting Standards Update 2018-02 [Member] | Subsequent Event [Member] | Scenario, Forecast [Member] | Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle in period of adoption				$ 125,000,000
Shipping and Handling [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of goods sold	$ 390,000,000	$ 290,000,000	$ 230,000,000
Minimum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Share-based payment awards granted vesting period range (in years)	1 year
Minimum [Member] | Accounting Standards Update 2016-02 [Member] | Subsequent Event [Member] | Scenario, Forecast [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, asset				920,000,000
Operating lease, liability				920,000,000
Minimum [Member] | Building and Building Improvements [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property plant and equipment useful life (in years)	10 years
Minimum [Member] | Machinery and Equipment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property plant and equipment useful life (in years)	5 years
Maximum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Share-based payment awards granted vesting period range (in years)	5 years
Maximum [Member] | Accounting Standards Update 2016-02 [Member] | Subsequent Event [Member] | Scenario, Forecast [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, asset				1,110,000,000
Operating lease, liability				$ 1,110,000,000
Maximum [Member] | Building and Building Improvements [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property plant and equipment useful life (in years)	40 years
Maximum [Member] | Machinery and Equipment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property plant and equipment useful life (in years)	15 years