Goodwill - Schedule of Reconciliation of Activity for Goodwill (Detail) - USD ($) $ in Thousands |
9 Months Ended | ||||||
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Sep. 30, 2018 |
Oct. 01, 2017 |
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Goodwill And Intangible Assets Disclosure [Abstract] | |||||||
Beginning balance - goodwill | $ 169,316 | $ 144,586 | |||||
Goodwill, System Transformation Transactions acquisitions | 19,035 | ||||||
Goodwill, Measurement period adjustments | [1] | (3,413) | 1,807 | ||||
Goodwill, Balance held for sale | [2] | (12,727) | |||||
Ending balance - goodwill | $ 165,903 | $ 152,701 | |||||
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