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Information about Geographic Areas and Products - Subscription Revenues (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting Information [Line Items]    
Total subscription revenues $ 543,325 $ 387,584 [1]
Service management products    
Segment Reporting Information [Line Items]    
Total subscription revenues 462,562 343,792
ITOM products    
Segment Reporting Information [Line Items]    
Total subscription revenues $ 80,763 $ 43,792
[1] As adjusted to reflect the impact of the full retrospective adoption of Topic 606. See Note 2 for further details