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Income Taxes - Additional Information (Detail) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Federal corporate tax rate | 21.00% | 35.00% | 21.00% | 35.00% | 35.00%
Income tax rate |  |  | (14.00%) |  |
Increase (decrease) in effective tax rate |  |  | (7.20%) |  |

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