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Revenue - Changes in Deferred Revenue (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Deferred Revenue Disclosure [Abstract]  
Deferred revenue, beginning balance $ 156,135
Deferral of revenue 42,533
Recognition of deferred revenue (46,701)
Foreign currency translation 255
Deferred revenue, ending balance $ 152,222