Charter documents and Delaware law description.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Net number of share options (or share units) granted during the period.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Long-term incentive compensation and shareholders' equity - Additional Information (Detail) - USD ($)			2 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015	Feb. 24, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jul. 13, 2016	Jun. 20, 2016	Apr. 30, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for future grants								7,500,000
Aggregate intrinsic value of stock awards exercised				$ 73,001,000	$ 116,933,000	$ 151,342,000
Aggregate intrinsic value of stock awards outstanding				79,717,000
Aggregate intrinsic value exercisable				23,566,000
Contributions used to purchase stock accumulated through payroll withholdings or through optional lump sum payments		$ 741,926,000		815,761,000	741,926,000
Long-term incentive program (LTIP) expense				73,337,000	130,682,000	118,970,000
Stock-based compensation expense				38,338,000	56,664,000	56,743,000
Estimated tax benefits recorded for stock-based compensation				12,731,000	19,689,000	20,351,000
Unrecognized compensation cost related to outstanding LTIP awards				92,987,000
Unrecognized compensation cost related to nonvested stock-based compensation arrangements under equity compensation and stock purchase plans				$ 59,016,000
Unrecognized compensation cost related to nonvested stock-based compensation arrangements under performance-based cash component of LTIP costs, weighted average remaining period (in years)				1 year
Unrecognized compensation cost related to nonvested stock-based compensation arrangements under stock-based component of LTIP costs, weighted average remaining period (in years)				1 year 4 months 24 days
Tax benefits from stock award exercises				$ 28,397,000	45,749,000	59,119,000
Proceeds from stock option exercises				$ 0	$ 0	0
Purchase of treasury stock (in shares)				16,649,090	7,779,958
Purchase of treasury stock				$ 1,072,377,000	$ 575,380,000
Purchase of treasury stock, average price per share				$ 64.41	$ 73.96
Share repurchase program, authorized amount							$ 1,240,748,000		$ 259,252,000
Share repurchase program, available under the current board authorizations for additional share repurchase				$ 677,104,000
Charter documents and Delaware law description				The Company’s charter documents include provisions that may deter hostile takeovers, delay or prevent changes of control or changes in management, or limit the ability of stockholders to approve transactions that they may otherwise determine to be in their best interests. These include provisions prohibiting stockholders from acting by written consent, requiring 90 days advance notice of stockholder proposals or nominations to the Board of Directors and granting the Board of Directors the authority to issue up to five million shares of preferred stock and to determine the rights and preferences of the preferred stock without the need for further stockholder approval. The Company is also subject to Section 203 of the Delaware General Corporation Law which, subject to exceptions, would prohibit the Company from engaging in any business combinations with any interested stockholder, as defined in that section, for a period of three years following the date on which that stockholder became an interested stockholder. These restrictions may discourage, delay or prevent a change in the control of the Company.
Preferred stock authorized to be issued		5,000,000		5,000,000	5,000,000
Acquisition of additional ownership interests in several existing majority-owned joint ventures				$ 21,512,000	$ 66,382,000	17,876,000
Deferred purchase price obligations						$ 136,000
Subsequent Event
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Purchase of treasury stock (in shares)			0
Stock Incentive Plan 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for future grants				30,543,883
Stock Incentive Plan 2011 \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period				36 months
Stock Incentive Plan 2011 \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Terms of award (in years)				5 years
Vesting period				48 months
Stock Appreciation Rights
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding balance		8,533,561		7,337,266	8,533,561
Weighted average fair value				$ 13.74	$ 17.97	$ 16.41
Stock Appreciation Rights \| Stock Incentive Plan 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding balance				7,337,266
Cash-settled stock appreciation \| Stock Incentive Plan 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding balance				33,000
Stock Settled Stock Units \| Stock Incentive Plan 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding balance				785,553
Cash Settled Stock Units \| Stock Incentive Plan 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding balance				1,600
Cash-settled stock-based awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock granted				9,600,000
Liability-classified share awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding balance				34,600
Stock-based compensation expense, fair value adjustment				$ 376,000	$ (236,000)	$ 1,774,000
Shares vested in period				5,000
Stock-based compensation liability				$ 124,000
Employee stock purchase plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for future grants				7,484,395
Employee entitlement for purchase of the Company's common stock during each calendar year				$ 25,000
Stock purchase price as percentage of fair market value	100.00%	100.00%		85.00%
Contributions used to purchase stock accumulated through payroll withholdings or through optional lump sum payments		$ 24,523,000		$ 23,902,000	$ 24,523,000	$ 19,010,000
Stock issued for employee stock purchase plans				438,002	413,859	297,954
Expected volatility Rate				22.00%	26.00%	27.00%
Risk-free interest rate				0.80%	0.20%	0.20%
Expected Dividend				$ 0	$ 0	$ 0
Weighted average fair value				$ 16.73	$ 18.76	$ 16.40