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Information on Business Segments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Number of customers accounted for greater than 10% of net sales	2	2	2
Customer Concentration Risk | Net Sales [Member] | The Home Depot, Inc. [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Percentage of net sales to major customer	15.00%	14.00%	13.00%
Customer Concentration Risk | Net Sales [Member] | Lowe's Companies, Inc [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Percentage of net sales to major customer	15.00%	14.00%	14.00%

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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