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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 |  |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Purchase price of common stock expressed as a percentage of its fair value. + References No definition available. + Details
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- Definition Number of shares issued during the period as a result of an employee stock purchase plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Stock Split -URI http://asc.fasb.org/extlink&oid=6525746 + Details
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