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Share based compensation arrangement by share based payment award award reduction rate.

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Share based compensation arrangement by share based payment award maximum share value authorized for purchase.

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Share based compensation fair value adjustment.

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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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Date the declared dividend will be paid, in CCYY-MM-DD format.

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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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 maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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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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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Disclosure of the weighted average expected dividend for an entity using a valuation technique with different dividend rates during the contractual term.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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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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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Purchase price of common stock expressed as a percentage of its fair value.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Amount of stock repurchase plan authorized.

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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Long-term incentive compensation and shareholders' equity - Additional Information (Detail)			1 Months Ended	3 Months Ended	12 Months Ended
	Jun. 17, 2013 shares	Jun. 11, 2012 shares	Jan. 31, 2016 USD ($) $ / shares shares	Sep. 30, 2013	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2013 USD ($) $ / shares shares	Apr. 14, 2015 USD ($)	Nov. 30, 2010 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock split ratio				2
Dividends payable date				Sep. 06, 2013
Dividends payable record date				Aug. 23, 2013
Aggregate intrinsic value of stock awards exercised					$ 116,933,000	$ 151,342,000	$ 120,775,000
Aggregate intrinsic value of stock awards outstanding					157,397,000
Aggregate intrinsic value exercisable					62,655,000
Payroll withholdings and lump-sum payments related to the plan, included in accrued compensation and benefits					741,926,000	698,475,000
Long-term incentive program (LTIP) expense					130,682,000	118,970,000	84,841,000
Stock-based compensation expense					56,664,000	56,743,000	59,998,000
Estimated tax benefits recorded for stock-based compensation					19,689,000	20,351,000	22,187,000
Unrecognized compensation cost related to outstanding LTIP awards					123,966,000
Unrecognized compensation cost related to nonvested stock-based compensation arrangements under equity compensation and stock purchase plans					$ 63,599,000
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 3 months 18 days
Tax benefits from stock award exercises					$ 45,749,000	59,119,000	46,898,000
Proceeds from stock option exercises					$ 0	$ 0	$ 0
Purchase of treasury stock (in shares) \| shares					7,779,958	0	0
Purchase of treasury stock					$ 575,380,000
Purchase of treasury stock, average price per share \| $ / shares					$ 73.96
Share repurchase program, authorized amount								$ 725,944,000	$ 274,056,000
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 that, 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 \| shares					5,000,000	5,000,000
Acquisition of additional ownership interests in several existing majority-owned joint ventures					$ 66,382,000	$ 17,876,000	$ 3,569,000
Deferred purchase price obligations						$ 136,000	$ 209,000
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase of treasury stock (in shares) \| shares			3,689,738
Purchase of treasury stock			$ 249,481,000
Purchase of treasury stock, average price per share \| $ / shares			$ 67.61
Share repurchase program, available under the current board authorizations for additional share repurchase			$ 259,225,000
Stock Appreciation Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding balance \| shares					8,533,561	10,585,172
Weighted average fair value \| $ / shares					$ 17.97	$ 16.41	$ 13.47
Liability-classified share awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding balance \| shares					58,555
Stock-based compensation expense, fair value adjustment					$ (236,000)	$ 1,774,000	$ 338,000
Shares vested in period \| shares					10,313
Stock-based compensation liability					$ 691,000
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants \| shares					422,401
Employee entitlement for purchase of the Company's common stock during each calendar year					$ 25,000
Payroll withholdings and lump-sum payments related to the plan, included in accrued compensation and benefits					$ 24,523,000	$ 19,010,000	$ 12,817,000
Stock issued for employee stock purchase plans \| shares					413,859	297,954	237,961
Expected volatility Rate					26.00%	27.00%	28.00%
Risk-free interest rate					0.20%	0.20%	0.20%
Expected Dividend					$ 0	$ 0	$ 0
Weighted average fair value \| $ / shares					$ 18.76	$ 16.40	$ 14.24
Employee stock purchase plan \| Beginning Of Period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock purchase price as percentage of fair market value					100.00%
Employee stock purchase plan \| End Of Period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock purchase price as percentage of fair market value					85.00%
Stock Incentive Plan 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in number of shares of common stock available for issuance \| shares	17,000,000	9,000,000
Award reduction rate		3.5			3.0
Shares available for future grants \| shares						32,484,534
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 Incentive Plan 2011 \| Stock Appreciation Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding balance \| shares						8,533,561
Stock Incentive Plan 2011 \| Cash-settled stock appreciation
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding balance \| shares						54,688
Stock Incentive Plan 2011 \| Stock Settled Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding balance \| shares						765,060
Stock Incentive Plan 2011 \| Cash Settled Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding balance \| shares						3,867