Unearned Revenue - Remaining Performance Obligation - Additional Information (Detail) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2018-07-01 |
Jun. 30, 2018 |
|---|---|
| Contract With Customer Liability [Line Items] | |
| Revenue allocated to remaining performance obligations, percentage of revenue expected to be recognized | 60.00% |
| Revenue allocated to remaining performance obligations, expected timing of satisfaction | 12 months |