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Revenues by Geographic Region (Detail) - Geographic Concentration Risk - Consolidated Revenue		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information
Revenues by geographic region		100.00%	100.00%
United States
Segment Reporting Information
Revenues by geographic region		99.00%	99.00%
Canada
Segment Reporting Information
Revenues by geographic region		1.00%	1.00%
Other Countries
Segment Reporting Information
Revenues by geographic region	[1]	0.00%	0.00%
[1] Less than 1% of revenue.

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

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No definition available.

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