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Income Taxes - Temporary Tax Effects (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Bonus and deferred compensation	$ 276,572	$ 208,198
Net operating losses (NOLs) and state tax credits	275,574	283,353
Bad debt and other reserves	57,506	56,313
Pension obligation	22,950	22,148
Investments	5,211	5,573
Tax effect on revenue items related to new revenue recognition guidance	(38,510)	(55,306)
Property and equipment	(49,935)	(40,024)
Unconsolidated affiliates and partnerships	(64,448)	6,267
Capitalized costs and intangibles	(289,674)	(256,087)
All other	(2,457)	(1,441)
Net deferred tax assets before valuation allowance	192,789	228,994
Valuation allowance	(248,511)	(277,466)
Net deferred tax (liabilities)	$ (55,722)	$ (48,472)

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