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Recent Accounting Standards - Additional Information (Detail) - USD ($) | Sep. 30, 2018 | Jan. 01, 2018 | Jan. 01, 2016
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New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Capitalized cost amortization period | 3 years |  |
ASU 2014-09 |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Capitalized cost amortization period | 3 years |  |
ASU 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Cumulative-effect adjustment to retained earnings |  |  | $ 13,000,000
ASU 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 | Deferred Revenue |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Cumulative-effect adjustment to retained earnings |  |  | (12,900,000)
ASU 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 | Deferred Tax Assets Net of Deferred Tax Liabilities |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Cumulative-effect adjustment to retained earnings |  |  | 5,200,000
ASU 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 | Other Non-current Assets |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Cumulative-effect adjustment to retained earnings |  |  | (4,400,000)
ASU 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 | Other Current Assets |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Cumulative-effect adjustment to retained earnings |  |  | $ (900,000)
Accounting Standards Update No. 2016-16 |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Cumulative-effect adjustment to retained earnings |  | $ 0 |

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