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Summary of Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Deferred Tax Assets And Liabilities [Line Items]    
Reserve for uncollectible accounts receivable $ 2,182 $ 1,379
Accrued compensation 7,602 6,342
Other reserves 2,517 3,154
Current deferred tax assets 12,301 10,875
Accrued compensation 5,411 4,670
Other reserves 514 966
Operating loss carryforwards 756 581
Less valuation allowance (122) (108)
Non-current deferred tax assets 6,559 6,109
Total deferred tax assets 18,860 16,984
Prepaids (2,404) (1,939)
Other receivables (4,932) (4,098)
Current deferred tax liabilities (7,336) (6,037)
Property and equipment (30,961) (27,457)
Goodwill (76,029) (70,416)
Non-current deferred tax liabilities (106,990) (97,873)
Total deferred tax liabilities $ (114,326) $ (103,910)