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Income Taxes - Significant Components of Deferred Income Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Components Of Deferred Income Tax Assets And Liabilities [Line Items]    
Allowance for uncollectible accounts $ 82,928 $ 48,178
Reserves and accruals 66,655 62,708
Stock-based compensation 13,662 14,354
Net operating loss carryforward 51,505 10,933
Property and equipment 3,116 1,524
Other 2,723 1,461
Deferred tax assets before valuation allowance 220,589  
Less: Valuation allowance (1,552)  
Total deferred tax assets 219,037 139,158
Gross deferred tax liabilities:    
Amortization (311,303) (214,968)
Accrual to cash adjustment (55,046) (38,524)
Other (6,693) (192)
Total deferred tax liabilities (373,042) (253,684)
Net deferred tax liability $ (154,005) (114,526)
Current [Member]    
Components Of Deferred Income Tax Assets And Liabilities [Line Items]    
Allowance for uncollectible accounts   48,178
Reserves and accruals   26,066
Stock-based compensation   8,346
Net operating loss carryforward   1,504
Other   583
Total deferred tax assets   84,677
Gross deferred tax liabilities:    
Accrual to cash adjustment   (38,524)
Other   (192)
Total deferred tax liabilities   (38,716)
Net deferred tax asset   45,961
Non-Current [Member]    
Components Of Deferred Income Tax Assets And Liabilities [Line Items]    
Reserves and accruals   36,642
Stock-based compensation   6,008
Net operating loss carryforward   9,429
Property and equipment   1,524
Other   878
Total deferred tax assets   54,481
Gross deferred tax liabilities:    
Amortization   (214,968)
Total deferred tax liabilities   (214,968)
Net deferred tax liability   $ (160,487)