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INCOME TAXES - ADDITIONAL INFORMATION (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred Income Tax Expense (Benefit) |  |  | $ 900 |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount |  | $ 3,700 | 3,400 |
Amortization of intangible assets | $ 540,520 | 159,573 |  |
Deferred Tax Assets, Tax Deferred Expense, Other | 8,200 |  |  |
Deferred Tax Assets, Operating Loss Carryforwards | 36,923 | 10,486 |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | 55,637 | 1,247 |  |
Deferred Tax Assets, Valuation Allowance | 60,629 | 5,854 |  |
Unrecognized Tax Benefits | 68,075 | 54 | 1,293 | $ 4,348
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 29,100 | 100 | 1,300 |
Decrease in Unrecognized Tax Benefits is Reasonably Possible | 3,600 |  |  |
Interest related to uncertain tax positions | 300 | 800 | $ 200 |
Unrecognized Tax Benefits, Interest on Income Taxes Accrued | 5,500 | 100 |  |
Undistributed Earnings of Foreign Subsidiaries | 1,835,000 |  |  |
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries | 75,000 |  |  |
Unrecognized Tax Benefits, Income Tax Penalties Accrued | 1,500 |  |  |
General Business Tax Credit Carryforward [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred Tax Assets, Valuation Allowance | 30,100 | 1,200 |  |
Anixter International [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Amortization of intangible assets | 347,300 |  |  |
Internal Revenue Service (IRS) [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Taxes Payable | 63,300 | 36,800 |  |
Foreign Tax Authority |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign | 34,500 | 7,900 |  |
Operating Loss Carryforwards, Valuation Allowance | 22,300 | 4,600 |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign | 55,600 | 1,200 |  |
State and Local Jurisdiction [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards | 2,400 | $ 2,600 |  |
Domestic Tax Authority |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | $ 4,200 |  |  |

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