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Summarizes the Preliminary Allocation of Total Consideration to Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Dec. 03, 2018
Business Acquisition [Line Items]      
Goodwill $ 484,496 $ 483,584  
CaseStack, Inc. [Member]      
Business Acquisition [Line Items]      
Accounts receivable trade     $ 31,917
Prepaid expenses and other current assets     694
Property and equipment     3,247
Deferred tax assets     6,433
Goodwill     165,943
Other intangibles     75,600
Other assets     120
Total assets acquired     283,954
Accounts payable trade     24,542
Accrued payroll     2,811
Accrued other     3,743
Total liabilities assumed     31,096
Total consideration     $ 252,858