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Significant Components of Current and Long-Term Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Components Of Deferred Tax Assets And Liabilities [Line Items] |  |  |  |
Capitalized inventory costs and inventory reserves | $ 2,386 |  | $ 2,966 |
Allowance for doubtful accounts | 1,084 |  | 1,634 |
Other current deferred tax assets | 1,215 |  | 979 |
Self-insurance reserves | 1,039 |  | 769 |
Total current deferred tax assets | 5,724 | [1] | 6,348 | [1]
Share-based compensation | 13,911 |  | 11,688 |
Other long-term deferred tax assets | 797 |  | 1,021 |
Net operating loss carryforwards | 609 |  | 648 |
Total long-term deferred tax assets | 15,317 |  | 13,357 |
Valuation allowance | (391) |  | (423) |
Total long-term deferred tax assets | 14,926 | [2] | 12,934 | [2]
Deductible goodwill | (66,636) |  | (46,057) |
Depreciation | (3,100) |  | (2,500) |
Other long-term deferred tax liabilities | (1,358) |  | (1,141) |
Total long-term deferred tax liabilities | (71,094) | [2] | (49,698) | [2]
Net deferred tax liabilities | $ (50,444) |  | $ (30,416) |
[1] | Current deferred tax assets have been included in the consolidated balance sheets in other current assets.
[2] | Long-term deferred tax assets and liabilities have been included in the consolidated balance sheets in deferred income taxes and other liabilities.

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- Definition Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 11 -Subparagraph d, e, f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6969291&loc=d3e28680-109314 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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