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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount |  | $ 2.0
Cumulative Undistributed Earnings of non-U.S. subsidiaries intended to be indefinitely reinvested | $ 33.7 |
More Likely Than Not Threshold Recognition of Uncertain Tax Position | 50.00% |
Unrecognized future tax benefits that would favorably impact future effective tax rate if recognized | $ 16.2 |
Alternative Minimum Tax Credit Refund | 0.5 |
Foreign [Member] |  |
Benefit from a Valuation Allowance Release |  | $ 0.8
Operating Loss Carryforwards | 137.1 |
U.S. Federal [Member] |  |
Operating Loss Carryforwards | 70.4 |
Tax credit carryovers | $ 14.4 |
Year that federal tax credits expire | Jan. 01, 2031 |
Internal Revenue Service (IRS) NOL carryforward expire between 2021 through 2037 [Member] |  |
Operating Loss Carryforwards | $ 37.8 |
California Franchise Tax Board [Member] |  |
Operating Loss Carryforwards | 28.1 |
Tax credit carryovers | $ 36.5 |
Tax credit expiration | will not expire |
State [Member] |  |
Operating Loss Carryforwards | $ 35.0 |
Certain Foreign NOLs |  |
Operating loss carryforwards, expiration date | Jan. 01, 2027 |
Minimum [Member] | U.S. Federal [Member] |  |
Operating loss carryforwards, expiration date | Jan. 01, 2021 |
Minimum [Member] | California Franchise Tax Board [Member] |  |
Operating loss carryforwards, expiration date | Jan. 01, 2029 |
Maximum [Member] | U.S. Federal [Member] |  |
Operating loss carryforwards, expiration date | Jan. 01, 2037 |
Maximum [Member] | California Franchise Tax Board [Member] |  |
Operating loss carryforwards, expiration date | Jan. 01, 2040 |

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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 increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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