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Revenues by Geographic Region (Detail)
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12 Months Ended | ||||||
|---|---|---|---|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Segment Reporting Information | |||||||
| Revenue by geographic region | 100.00% | 100.00% | 100.00% | ||||
| United States | |||||||
| Segment Reporting Information | |||||||
| Revenue by geographic region | 95.00% | 95.00% | 94.00% | ||||
| Canada | |||||||
| Segment Reporting Information | |||||||
| Revenue by geographic region | 3.00% | 5.00% | 6.00% | ||||
| Other Countries | |||||||
| Segment Reporting Information | |||||||
| Revenue by geographic region | 2.00% | [1] | [1] | ||||
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