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Restructuring - Summary of Restructuring Reserves and Provision Activity (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2018
Restructuring Cost and Reserve [Line Items]      
Restructuring charges $ (6,376)   $ (6,570)
Personnel Related [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring reserve, beginning balance 542 $ 1,333 1,333
Restructuring charges   194 4,031
Cash payments   (985) (479)
Foreign currency exchange rate changes     (5)
Restructuring reserve, ending balance $ 4,089 $ 542 $ 4,089