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Goodwill and Other Intangible Assets Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |
Goodwill | $ 637,486,000 |  | $ 637,486,000 |  | $ 433,374,000
Total other intangible assets, net | 877,945,000 |  | 877,945,000 |  | $ 347,212,000
Amortization expense of intangible assets | 10,403,000 | $ 6,344,000 | 22,586,000 | $ 18,792,000 |
Estimated Future Amortization Expense by Fiscal Year [Abstract] |  |  |  |  |
Remainder of 2016 | 10,500,000 |  | 10,500,000 |  |
2017 | 40,500,000 |  | 40,500,000 |  |
2018 | 35,500,000 |  | 35,500,000 |  |
2019 | 32,700,000 |  | 32,700,000 |  |
2020 | 27,700,000 |  | 27,700,000 |  |
2021 | 25,300,000 |  | 25,300,000 |  |
After 2021 | $ 264,800,000 |  | $ 264,800,000 |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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