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Goodwill and Identifiable Intangible Assets - Summary of Acquired Intangible Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Finite-Lived Intangible Assets [Line Items] |  |
Accumulated Amortization | $ (19,235) | $ (12,020)
Net Carrying Amount | 75,736 |
Total intangible assets, Gross Carrying Amount | 94,971 | 40,263
Total intangible assets, Net Carrying Amount | 75,736 | 28,243
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 73,875 | 21,200
Accumulated Amortization | (6,800) | (3,220)
Net Carrying Amount | 67,075 | 17,980
Developed technologies |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 6,683 | 6,497
Accumulated Amortization | (5,411) | (3,891)
Net Carrying Amount | 1,272 | 2,606
Trade name and other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 14,413 | 12,566
Accumulated Amortization | (7,024) | (4,909)
Net Carrying Amount | $ 7,389 | $ 7,657

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