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Restructuring and Other - Restructuring and Other Reserve Activities (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Restructuring and Related Activities [Abstract]    
Reserve balance at January 1 $ 1,824 $ 3,019
Restructuring charges 5,136 2,808
Other charges 2,424 3,921
Non-cash restructuring and other (264) (403)
Cash payments (6,668) (7,521)
Reserve balance at December 31 $ 2,452 $ 1,824