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Revenues by Geographic Region (Detail) - Geographic Concentration Risk - Consolidated Revenue | 3 Months Ended
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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.

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