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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
--- | --- | ---
Deferred Tax Liability Not Recognized [Line Items] |  |
Allowance for uncollectible accounts | $ 44,232 | $ 47,459
Reserves and accruals | 43,345 | 40,807
Stock-based compensation | 18,444 | 18,657
Net operating loss carryforward | 5,624 | 3,533
Property and equipment | 802 |
Other | 509 | 483
Total deferred tax assets | 112,956 | 110,939
Amortization | (136,670) | (105,753)
Accrual to cash adjustment | (33,129) | (28,575)
Property and equipment |  | (128)
Total deferred tax liabilities | (169,799) | (134,456)
Net deferred tax (liability) asset | (56,843) | (23,517)
Current [Member] |  |
Deferred Tax Liability Not Recognized [Line Items] |  |
Allowance for uncollectible accounts | 44,232 | 47,459
Reserves and accruals | 39,942 | 36,828
Stock-based compensation | 11,856 | 10,586
Net operating loss carryforward | 5,624 | 3,533
Other | 509 | 483
Total deferred tax assets | 102,163 | 98,889
Accrual to cash adjustment | (33,129) | (28,575)
Total deferred tax liabilities | (33,129) | (28,575)
Net deferred tax (liability) asset | 69,034 | 70,314
Non-Current [Member] |  |
Deferred Tax Liability Not Recognized [Line Items] |  |
Reserves and accruals | 3,403 | 3,979
Stock-based compensation | 6,588 | 8,071
Property and equipment | 802 |
Total deferred tax assets | 10,793 | 12,050
Amortization | (136,670) | (105,753)
Property and equipment |  | (128)
Total deferred tax liabilities | (136,670) | (105,881)
Net deferred tax (liability) asset | $ (125,877) | $ (93,831)

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