Other Intangible Assets (Schedule of Other Intangible Assets) (Detail) - USD ($) $ in Thousands |
Mar. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Intangible Assets Net Excluding Goodwill [Abstract] | ||
| Customer relationships | $ 94,611 | $ 93,572 |
| Noncompete agreements | 27,543 | 26,963 |
| Trademarks | 9,378 | 9,341 |
| Internal-use software licenses | 3,771 | |
| Patents | 2,840 | 2,840 |
| Finite-lived intangible assets, gross | 138,143 | 132,716 |
| Accumulated amortization | (104,996) | (101,479) |
| Finite-lived intangible assets, net | 33,147 | 31,237 |
| Licenses | 16,877 | 16,877 |
| Other intangibles assets, net | $ 50,024 | $ 48,114 |