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Income Taxes - Temporary Tax Effects (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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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

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