Other Intangible Assets (Schedule of Other Intangible Assets) (Detail) - USD ($) $ in Thousands |
Jun. 30, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Intangible Assets Net Excluding Goodwill [Abstract] | ||
| Customer relationships | $ 94,265 | $ 93,572 |
| Noncompete agreements | 27,519 | 26,963 |
| Trademarks | 9,376 | 9,341 |
| Internal-use software licenses | 7,905 | |
| Patents | 2,840 | 2,840 |
| Finite-lived intangible assets, gross | 141,905 | 132,716 |
| Accumulated amortization | (107,857) | (101,479) |
| Finite-lived intangible assets, net | 34,048 | 31,237 |
| Licenses | 16,884 | 16,877 |
| Other intangibles assets, net | $ 50,932 | $ 48,114 |