|
Goodwill - Allocation of Goodwill by Reportable Segment (Detail) (USD $)
|
3 Months Ended |
|
|
Mar. 31, 2015
|
Dec. 31, 2014
|
| Goodwill [Line Items] |
|
|
| Goodwill, gross, Beginning balance |
$ 1,573,200,000 |
|
| Foreign exchange |
(2,100,000) |
|
| Goodwill, gross, Ending balance |
1,571,100,000 |
|
| Accumulated impairment charges |
(121,300,000) |
|
| Goodwill, net |
1,449,822,000 |
1,451,887,000 |
| Wireless [Member] |
|
|
| Goodwill [Line Items] |
|
|
| Goodwill, gross, Beginning balance |
833,100,000 |
|
| Foreign exchange |
(2,100,000) |
|
| Goodwill, gross, Ending balance |
831,000,000 |
|
| Accumulated impairment charges |
(85,100,000) |
|
| Goodwill, net |
745,900,000 |
|
| Enterprise [Member] |
|
|
| Goodwill [Line Items] |
|
|
| Goodwill, gross, Beginning balance |
|
653,800,000 |
| Goodwill, gross, Ending balance |
653,800,000 |
653,800,000 |
| Goodwill, net |
653,800,000 |
|
| Broadband [Member] |
|
|
| Goodwill [Line Items] |
|
|
| Goodwill, gross, Beginning balance |
|
86,300,000 |
| Goodwill, gross, Ending balance |
86,300,000 |
86,300,000 |
| Accumulated impairment charges |
(36,200,000) |
|
| Goodwill, net |
$ 50,100,000 |
|