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Income Taxes - Significant Components of Deferred Income Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Current deferred tax asset (liability):    
Accounts receivable allowance for doubtful accounts $ 3,870 $ 3,321
State taxes (234) (741)
Estimated litigation loss and regulatory reserves 16 1,588
Other 1,507 1,313
Current deferred tax asset 5,159 5,481
Non-current deferred tax asset (liability):    
Depreciation and leases (24,711) (21,774)
Share-based compensation 7,987 8,294
Deferred rent 2,290 2,642
Intangibles 2,504 3,384
Other 98 409
Non-current deferred tax liability (11,832) (7,045)
Net deferred tax liability $ (6,673) $ (1,564)