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Treasury Stock Acquisition (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Schedule of Treasury Stock [Line Items]
Treasury shares at beginning of period		77,336,387			77,336,387
Treasury shares at end of period	83,327,919				83,327,919
Treasury shares at beginning of period		$ 1,345,134			$ 1,345,134
Treasury stock acquired, cost	$ 910	$ 20,025	$ 88,258	$ 75,113	20,935	$ 163,371
Treasury shares at end of period	$ 1,366,069				$ 1,366,069
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					165,266
Treasury stock acquired, cost					$ 935

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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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Number of shares that have been repurchased during the period and are being held in treasury.

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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