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Goodwill - Schedule of Reconciliation of Activity for Goodwill (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Oct. 01, 2017
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
[1] Measurement period adjustments relate to post-closing adjustments made in accordance with the terms and conditions of the applicable asset purchase agreement or asset exchange agreement for each System Transformation Transaction. See Note 3 to the consolidated condensed financial statements for additional information on the System Transformation Transactions.
[2] Goodwill of $12.7 million related to the October 2017 Divestitures was classified as held for sale as of October 1, 2017.