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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Line Items] |  |  |  |
U.S. federal corporate tax rate |  | 34.90% | 35.00% | 35.00%
Tax cuts and jobs act of 2017, accounting complete [true false] |  | false |  |
Change in net deferred tax expense (benefit) |  | $ (75,200) |  |
Operating loss carryforwards |  | 1,388 | $ 1,399 |
State incentive tax credit carryforwards |  | 3,411 | 1,694 |
Valuation allowances |  | 1,681 | 456 |
Unrecognized tax benefits |  | 3,827 | 1,832 | $ 1,139
Potential increase (decrease) in income tax provision |  | 2,800 | $ 1,200 |
Income tax interest and penalty recognized |  | 3 |  |
Tax settlement, amount |  | 10,000 |  |
State [Member] | Net Operating Losses [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Valuation allowances |  | 100 |  |
State [Member] | Tax Incentive Credit Carryforwards [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Valuation allowances |  | $ 1,600 |  |
Minimum [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating loss carryforwards, expiration date |  | Dec. 31, 2018 |  |
Tax credit carryforward, expiration date |  | Dec. 31, 2019 |  |
Possible reduction in unrecognized tax benefits resulting from audit settlements |  | $ 1,000 |  |
Maximum [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating loss carryforwards, expiration date |  | Dec. 31, 2037 |  |
Tax credit carryforward, expiration date |  | Dec. 31, 2022 |  |
Possible increase in unrecognized tax benefits resulting from audit settlements |  | $ 1,000 |  |
Scenario, Previously Reported [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
U.S. federal corporate tax rate |  | 35.00% |  |
Scenario, Forecast [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
U.S. federal corporate tax rate | 21.00% |  |  |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28680-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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- Definition Amount of increase reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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