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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)

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