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Significant Components of Net Deferred Tax Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Components of Net Deferred Tax Liabilities [Line Items]    
Share-based compensation $ 18,977 $ 26,239
Capitalized inventory costs and inventory reserves 2,107 2,301
Allowance for doubtful accounts 929 1,379
Self-insurance reserves 153 500
Other 2,423 2,227
Net operating loss carryforwards 291 209
Total deferred tax assets, gross 24,880 32,855
Valuation allowance 0 0
Total deferred tax assets 24,880 32,855
Deductible goodwill (67,246) (88,581)
Depreciation (5,519) (5,883)
Other (5,189) (1,633)
Total deferred tax liabilities (77,954) (96,097)
Net deferred tax liabilities [1] $ (53,074) $ (63,242)
[1] At December 31, 2017, net deferred tax liabilities have been included in the consolidated balance sheet in deferred income taxes and other liabilities. At December 31, 2016, net current deferred tax assets and liabilities of $5,485 are included in the consolidated balance sheet in other current assets and net long-term deferred tax assets and liabilities of $68,727 are included in the consolidated balance sheet in deferred income taxes and other liabilities.