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

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

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

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Long-term incentive compensation and shareholders' equity - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended				0 Months Ended
	Sep. 30, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jun. 17, 2013	Jun. 11, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock split ratio	2
Stock-based compensation expense		$ 56,743	$ 59,998	$ 45,384
Aggregate intrinsic value of stock awards exercised		151,342	120,775	228,698
Aggregate intrinsic value of stock awards outstanding		310,351
Aggregate intrinsic value exercisable		84,129
Payroll withholdings and lump-sum payments related to the plan, included in accrued compensation and benefits		698,475	603,013
Stock-based compensation expense		118,970	84,841	45,820
Tax benefit for stock-based Compensation		20,351	22,187	16,874
Unrecognized compensation cost related to outstanding LTIP awards		122,574
Unrecognized compensation cost related to nonvested stock-based compensation arrangements under equity compensation and stock purchase plans		73,585
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 equity compensation and stock purchase plans, weighted average remaining period (in years)		1 year 3 months 18 days
Tax benefits from stock award exercises		59,119	46,898	88,964
Proceeds from stock option exercises		0	0	2,175
Common stock shares repurchased		0	0		0
Repurchase share authorized outstanding amount		358,200
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		5,000,000us-gaap_PreferredStockSharesAuthorized	5,000,000us-gaap_PreferredStockSharesAuthorized
Acquisition of additional ownership interests in several existing majority-owned joint ventures		17,876us-gaap_PaymentsToMinorityShareholders	3,569us-gaap_PaymentsToMinorityShareholders	26,761us-gaap_PaymentsToMinorityShareholders
Deferred purchase price obligations		136	209
Stock Appreciation Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding balance		10,585,172	12,956,094
Weighted average fair value		$ 16.41	$ 13.47	$ 11.28
Liability-classified share awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding balance		72,734
Stock-based compensation expense		1,774	338	175
Shares vested in period		10,625
Stock-based liability		1,242
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants		836,421
Employee entitlement for purchase of the Company's common stock during each calendar year		25
Payroll withholdings and lump-sum payments related to the plan, included in accrued compensation and benefits		$ 19,010	$ 12,817	$ 8,322
Stock issued for employee stock purchase plans		297,954	237,961	202,658
Expected volatility Rate		27.00%	28.00%	26.00%
Risk-free interest rate		0.20%	0.20%	0.10%
Weighted average fair value		$ 16.40	$ 14.24	$ 10.05
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						17,000,000	9,000,000
Award reduction rate		3.0					3.5
Shares available for future grants		33,687,881
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		10,585,172
Stock Incentive Plan 2011 \| Cash-settled stock appreciation
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding balance		65,000
Stock Incentive Plan 2011 \| Stock Settled Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding balance		921,898
Stock Incentive Plan 2011 \| Cash Settled Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding balance		7,734