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Revenue - Schedule of Accounts Receivable and Deferred Revenues (Detail)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
Deferred Revenue - Short Term  
Contract With Customer Asset And Liability [Line Items]  
Deferred Revenue, Beginning balance $ 74,332
Net increase (decrease) during the period 20,341
Deferred Revenue, Ending balance 94,673
Deferred Revenue - Long Term  
Contract With Customer Asset And Liability [Line Items]  
Deferred Revenue, Beginning balance 2,049
Net increase (decrease) during the period (276)
Deferred Revenue, Ending balance $ 1,773