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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
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Components Of Deferred Income Tax Assets And Liabilities [Line Items] |  |
Allowance for uncollectible accounts | $ 42,425 | $ 44,232
Reserves and accruals | 52,519 | 43,345
Stock-based compensation | 16,457 | 18,444
Net operating loss carryforward | 6,385 | 5,624
Property and equipment | 1,310 | 802
Other | 446 | 509
Total deferred tax assets | 119,542 | 112,956
Amortization | (162,399) | (136,670)
Accrual to cash adjustment | (37,818) | (33,129)
Total deferred tax liabilities | (200,217) | (169,799)
Net deferred tax (liability) asset | (80,675) | (56,843)
Current [Member] |  |
Components Of Deferred Income Tax Assets And Liabilities [Line Items] |  |
Allowance for uncollectible accounts | 42,425 | 44,232
Reserves and accruals | 49,128 | 39,942
Stock-based compensation | 10,914 | 11,856
Net operating loss carryforward | 6,385 | 5,624
Other | 446 | 509
Total deferred tax assets | 109,298 | 102,163
Accrual to cash adjustment | (37,818) | (33,129)
Total deferred tax liabilities | (37,818) | (33,129)
Net deferred tax (liability) asset | 71,480 | 69,034
Non-Current [Member] |  |
Components Of Deferred Income Tax Assets And Liabilities [Line Items] |  |
Reserves and accruals | 3,391 | 3,403
Stock-based compensation | 5,543 | 6,588
Property and equipment | 1,310 | 802
Total deferred tax assets | 10,244 | 10,793
Amortization | (162,399) | (136,670)
Total deferred tax liabilities | (162,399) | (136,670)
Net deferred tax (liability) asset | $ (152,155) | $ (125,877)

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