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Treasury Stock Acquisition (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Schedule of Treasury Stock [Line Items]
Treasury shares at beginning of period	77,336,387
Treasury shares at end of period	83,165,792
Treasury shares at beginning of period	$ 1,345,134
Treasury stock acquired, cost	20,025	$ 75,113
Treasury shares at end of period	$ 1,365,159
Stock Buyback Program
Schedule of Treasury Stock [Line Items]
Treasury stock acquired, shares	5,826,266
Treasury stock acquired, cost	$ 20,000
Long Term Incentive Plan
Schedule of Treasury Stock [Line Items]
Treasury stock acquired, shares	3,139
Treasury stock acquired, cost	$ 25

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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