Segment Information (Details) - Revenue [Member] |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2015 |
Sep. 30, 2014 |
Sep. 30, 2015 |
Sep. 30, 2014 |
|
| Segment Reporting Information [Line Items] | ||||
| Total consolidated revenue | 100.00% | 100.00% | 100.00% | 100.00% |
| United States [Member] | ||||
| Segment Reporting Information [Line Items] | ||||
| Total consolidated revenue | 64.00% | 70.20% | 66.60% | 74.00% |
| Canada [Member] | ||||
| Segment Reporting Information [Line Items] | ||||
| Total consolidated revenue | 6.00% | 6.80% | 7.00% | 6.50% |
| U.K. [Member] | ||||
| Segment Reporting Information [Line Items] | ||||
| Total consolidated revenue | 22.20% | 17.40% | 20.10% | 16.70% |
| Other foreign markets [Member] | ||||
| Segment Reporting Information [Line Items] | ||||
| Total consolidated revenue | 7.80% | 5.60% | 6.30% | 2.80% |