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Income Taxes - Significant Components of Deferred Income Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]    
Allowance for uncollectible accounts $ 103,525 $ 82,928
Reserves and accruals 62,212 66,655
Stock-based compensation 13,726 13,662
Net operating loss carryforward 49,156 51,505
Property and equipment 1,621 3,116
Other 1,610 2,723
Deferred tax assets before valuation allowance 231,850 220,589
Less: Valuation allowance (4,014) (1,552)
Total deferred tax assets 227,836 219,037
Gross deferred tax liabilities:    
Amortization (380,594) (311,303)
Accrual to cash adjustment (53,771) (55,046)
Other (1,023) (6,693)
Total deferred tax liabilities (435,388) (373,042)
Net deferred tax liability $ (207,552) $ (154,005)