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Income Taxes - Reconciliation of U.S. Federal Statutory Rate (Detail) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |  |
U.S. statutory rate | (21.00%) | (35.00%) | (35.00%) | (35.00%)
Change in valuation allowance |  | (116.90%) | (5.40%) | 14.90%
State income taxes, net of federal benefit |  | (5.20%) | (1.20%) | (0.70%)
Share-based compensation |  | 8.30% | 2.60% | 2.70%
International tax rate differential |  | (6.70%) | (6.40%) | (5.50%)
Foreign dividend income |  | 48.10% | 1.00% | 12.40%
Unremitted foreign earnings |  | (35.60%) | 22.00% |
Foreign capital gain income |  |  |  | 3.60%
Reserve for tax contingencies |  |  | (0.20%) | 0.10%
Expiration of un-utilized tax credits |  | 1.50% |  | 10.40%
Unrealized gain on investments |  |  | 30.70% |
Change in tax rate |  | 52.40% |  |
Other |  | (2.60%) | (1.50%) | 1.20%
Income tax provision |  | (91.70%) | 6.60% | 4.10%

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