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Revenues by Geographic Region (Detail) - Geographic Concentration Risk - Consolidated Revenue	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information
Revenues by geographic region	100.00%	100.00%	100.00%	100.00%
United States
Segment Reporting Information
Revenues by geographic region	99.00%	98.00%	99.00%	98.00%
Canada
Segment Reporting Information
Revenues by geographic region	1.00%	2.00%	1.00%	2.00%

X

- 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.

+ References

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