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Significant Components of Net Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Components of Net Deferred Tax Liabilities [Line Items] |  |  |
Share-based compensation |  | $ 27,223 | $ 24,413
Capitalized inventory costs and inventory reserves |  | 3,189 | 3,627
Allowance for doubtful accounts |  | 949 | 1,338
Self-insurance reserves |  | 518 | 209
Other |  | 5,090 | 2,212
Net operating loss carryforwards |  | 2,930 | 2,036
Total deferred tax assets, gross |  | 39,899 | 33,835
Valuation allowance |  | (668) | (655)
Total deferred tax assets |  | 39,231 | 33,180
Deductible goodwill |  | (78,288) | (73,898)
Depreciation |  | (16,441) | (14,241)
Other |  | (7,050) | (7,188)
Total deferred tax liabilities |  | (101,779) | (95,327)
Net deferred tax liabilities | [1] | $ (62,548) | $ (62,147)
[1] | Net deferred tax liabilities have been included in the consolidated balance sheets in deferred income taxes and other liabilities.

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