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Components of Deferred Income Tax Amounts (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Deferred Income Tax Assets |  |
Provision for bad debts | $ 7,585 | $ 7,123
Employee retirement and other benefit obligations | 62,637 | 54,708
Workers' compensation | 10,007 | 8,526
Deferred compensation | 10,895 | 15,502
Credits and net operating loss carryforwards | 48,609 | 42,289
Other | 23,781 | 16,427
Total deferred income tax assets | 163,514 | 144,575
Deferred Income Tax Liabilities |  |
Amortization of intangible assets | (22,169) | (20,475)
Property and equipment basis differences | (8,029) | (8,823)
Other | (5,257) | (4,742)
Total deferred income tax liabilities | (35,455) | (34,040)
Valuation allowance | (39,310) | (36,334)
Total deferred income tax assets, net | $ 88,749 | $ 74,201

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