Goodwill and Intangible Assets - Summary of Intangible Assets (Detail) - USD ($)
$ in Thousands |
9 Months Ended |
12 Months Ended |
Sep. 30, 2016 |
Dec. 31, 2015 |
| Intangible Assets by Major Class |
|
|
| Definite-lived intangible assets |
$ 778,586
|
$ 620,985
|
| Accumulated Amortization |
(345,482)
|
(302,878)
|
| Intangible assets, net |
433,104
|
318,107
|
| Finite-Lived Intangible Assets, Net |
$ 433,104
|
318,107
|
| Definite-lived intangible assets, weighted average amortization period |
6 years 1 month
|
|
| Finite-Lived Intangible Assets, Translation Adjustments |
$ 700
|
400
|
| Domain/Trade Names |
|
|
| Intangible Assets by Major Class |
|
|
| Intangible Assets, Gross (Excluding Goodwill) |
159,921
|
132,228
|
| Accumulated Amortization |
0
|
0
|
| Intangible assets, net |
159,921
|
132,228
|
| Customer relationships |
|
|
| Intangible Assets by Major Class |
|
|
| Definite-lived intangible assets |
324,470
|
289,710
|
| Accumulated Amortization |
(149,735)
|
(128,212)
|
| Finite-Lived Intangible Assets, Net |
$ 174,735
|
$ 161,498
|
| Definite-lived intangible assets, weighted average amortization period |
6 years 8 months
|
7 years 7 months
|
| Developed technology |
|
|
| Intangible Assets by Major Class |
|
|
| Definite-lived intangible assets |
$ 286,391
|
$ 193,020
|
| Accumulated Amortization |
(190,643)
|
(169,819)
|
| Finite-Lived Intangible Assets, Net |
$ 95,748
|
$ 23,201
|
| Definite-lived intangible assets, weighted average amortization period |
5 years
|
2 years 1 month 20 days
|
| Non-compete agreements and other |
|
|
| Intangible Assets by Major Class |
|
|
| Definite-lived intangible assets |
$ 7,804
|
$ 6,027
|
| Accumulated Amortization |
(5,104)
|
(4,847)
|
| Finite-Lived Intangible Assets, Net |
$ 2,700
|
$ 1,180
|
| Definite-lived intangible assets, weighted average amortization period |
1 year 6 months 25 days
|
2 years 4 months 19 days
|