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Income Taxes - Significant Components of Deferred Income Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Current deferred tax asset (liability):    
Accounts receivable allowance for doubtful accounts $ 3,321 $ 4,638
State taxes (741) (764)
Estimated litigation loss and regulatory reserves 1,588 76
Other 1,313 (597)
Current deferred tax asset 5,481 3,353
Non-current deferred tax asset (liability):    
Depreciation and leases (21,774) (18,763)
Share-based compensation 8,294 6,664
Deferred rent 2,642 2,353
Intangibles 3,384 4,121
Other 409 291
Non-current deferred tax (liability) asset (7,045) (5,334)
Net deferred tax (liability) asset $ (1,564) $ (1,981)