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RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE - Summary of Unbilled Receivables (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Receivables [Abstract]    
1 year or less $ 161,480 $ 172,656
1-2 years 86,496  
2-5 years 43,998  
Total $ 291,974  
Percentage of unbilled receivables, 1 Year or Less 55.00%  
Percentage of unbilled receivables, 1-2 Years 30.00%  
Percentage of unbilled receivables, 2-5 Years 15.00%  
Total percentage of unbilled receivables 100.00%