Goodwill and Other Intangible Assets - Summary of Estimated Charges to Amortization Expense of Intangible Assets (Detail) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Goodwill and Intangible Assets Disclosure [Abstract] | ||||
| Amortization expense | $ 8,423 | $ 7,259 | $ 23,966 | $ 21,455 |
| Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] | ||||
| July 1, 2016 through Dec. 31, 2016 | 19,454 | 19,454 | ||
| 2015 | 43,542 | 43,542 | ||
| 2016 | 43,046 | 43,046 | ||
| 2017 | 42,162 | 42,162 | ||
| 2018 | 41,916 | 41,916 | ||
| Total amortization expense | $ 190,120 | $ 190,120 | ||