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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)