Other Intangible Assets (Narrative) (Detail) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2016 |
Jun. 30, 2015 |
Jun. 30, 2016 |
Jun. 30, 2015 |
|
| Intangible Assets Net Excluding Goodwill [Abstract] | ||||
| Amortization expense | $ 3.2 | $ 2.4 | $ 5.6 | $ 4.8 |