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New Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Corporate income tax rate percent | 21.00% |  | 35.00%
ASU 2016-15 | Reclassified from Operating Activities to Financing Activities | June 2017 Amendment of Senior Secured Credit Facility |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Cash paid |  | $ 246 |

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