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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2018
Income Taxes [Line Items] |  |  |  |  |  |  |
Corporate tax rate | 21.00% | 21.00% | 21.00% | 21.00% | 35.00% |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  |  |  |  |  | $ 12,800 |
Tax cuts and jobs Act, increased tax provision on undistributed and previously untaxed post-1986 earnings and profits of the specified foreign corporation |  |  |  |  | $ 1,300 | 3,300 |
Impact on assets and liabilities due to change in accounting principle |  |  |  |  |  | $ (677) |
Income tax (benefit) provision | 0.70% | 27.60% | 18.30% | 24.60% |  |  |
Accounting Standards Update 2016-06 [Member] | Other Assets [Member] |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Impact on assets and liabilities due to change in accounting principle |  |  |  |  |  |  | $ 5,700
Accounting Standards Update 2016-06 [Member] | Deferred tax liablities [Member] |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Impact on assets and liabilities due to change in accounting principle |  |  |  |  |  |  | 5,000
Accounting Standards Update 2016-06 [Member] | accumulated deficit [Member] |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Impact on assets and liabilities due to change in accounting principle |  |  |  |  |  |  | $ 700
Latest Tax Year |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Net operating loss and business tax credit carry forwards expiration date |  |  |  |  | at various dates through December 2038 |  |
State |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Business tax credits carry forwards |  |  |  |  | $ 2,900 |  |
United States |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |
Business tax credits carry forwards |  |  |  |  | $ 400 |  |

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