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Income Taxes - Reconciliation Of The Statutory Federal Income Tax Expense And The Company's Total Income Tax Expense (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Federal income tax expense | $ 25 | $ 10,718 | $ 20,367
Change in valuation allowance – Capital losses(1) | 7,555 | 794 |
Change in valuation allowance -Foreign | 4,737 | 3,510 | 5,355
Decrease in unrecognized tax benefits | (3,894) |  |
Foreign operations | (3,561) | (1,041) | (165)
Loss/(gain) on revaluation of deferred consideration(2) | 2,378 | (2,570) |
Non-deductible executive compensation | 1,608 | 4 |
Stock-based compensation tax (windfalls)/shortfalls | 1,198 | (543) | 1,035
Blended state income tax rate, net of federal benefit | 237 | 1,406 | 2,234
Non-deductible acquisition and disposition-related costs |  | 1,506 | 1,549
Other differences, net | 263 | 622 | 618
Income tax expense | $ 10,546 | $ 14,406 | $ 30,993

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- Definition Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for award under share-based payment arrangement. Includes, but is not limited to, expense determined to be nondeductible upon grant or after for award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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