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Income Taxes - Temporary Tax Effects (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Bonus and deferred compensation $ 186,093 $ 265,043
Net operating losses (NOLs) and state tax credits 283,353 245,681
Bad debt and other reserves 56,313 75,620
Pension obligation 22,148 29,382
Unconsolidated affiliates 6,267 28,107
Investments 5,573 7,142
Foreign tax credits   53,976
Derivative financial instruments   7,308
Property and equipment (40,024) (87,679)
Capitalized costs and intangibles (256,087) (307,301)
All other (1,441) 2,049
Net deferred tax assets before valuation allowance 262,195 319,328
Valuation allowance (277,466) (284,723)
Net deferred tax (liabilities) $ (15,271)  
Net deferred tax assets   $ 34,605