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Goodwill - Schedule of Reconciliation of Activity for Goodwill (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Jan. 01, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
Beginning balance - goodwill $ 144,586 $ 117,954
Goodwill, System Transformation Transactions acquisitions 35,867 26,272
Goodwill, Divestitures (13,073)  
Goodwill, 2015 Asset Exchange   (682)
Goodwill, Measurement period adjustments 1,936 1,042
Ending balance - goodwill $ 169,316 $ 144,586