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Unearned Revenue - Remaining Performance Obligation - Additional Information (Detail) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2020-01-01
Dec. 31, 2019
Revenue Remaining Performance Obligation Expected Timing Of Satisfaction [Line Items]  
Revenue allocated to remaining performance obligations, percentage of revenue expected to be recognized 50.00%
Revenue allocated to remaining performance obligations, expected timing of satisfaction 12 months