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Contract Balances - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Contract With Customer Asset And Liability [Line Items] |  |  |
Bad debt expense and write-offs (reversals) | $ 1,900,000 | $ 2,300,000 | $ 200,000
Revenue, Remaining performance obligation | 183,000,000 |  |
Prepaid Expenses and Other Current Assets |  |  |
Contract With Customer Asset And Liability [Line Items] |  |  |
Assets impairment charges | 0 | 0 | 0
Contract assets | 800,000 | 1,200,000 |
Current Deferred Revenue and Advanced Payments |  |  |
Contract With Customer Asset And Liability [Line Items] |  |  |
Revenue recognized from beginning deferred revenue | $ 194,600,000 | $ 196,700,000 | $ 187,300,000

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