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Share-Based Compensation - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2016 USD ($) Plan $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of share-based compensation plans | Plan | 4 |  |
Common shares authorized under 2014 Stock Incentive Plan | shares | 8,700,000 |  |
Common shares remain for future issuance under share-based compensation plans | shares | 5,500,000 |  |
Realized income tax benefit for all awards | $ 14,800,000 | $ 16,600,000 | $ 16,600,000
Awards granted | shares | 0 | 0 | 0
Total vesting date fair value of stock units | $ 2,100,000 | $ 1,300,000 | $ 9,000,000
Reserved for issuance under employee stock purchase plan | shares | 2,000,000 |  |
Future issuance of employee stock purchase plan | shares | 1,700,000 |  |
Percent of fair market value for which eligible employees can purchase common shares under employee stock purchase plan | 85.00% |  |
Performance conditions [Member] | First Succeeding Year [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Awards vest, percentage | 20.00% |  |
Performance conditions [Member] | Second Succeeding Year [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Awards vest, percentage | 20.00% |  |
Performance conditions [Member] | Third Succeeding Year [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Awards vest, percentage | 60.00% |  |
Independent Director Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period beginning from the grant date | 1 year |  |
Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period beginning from the grant date | 5 years |  |
Contractual term | 10 years |  |
SARs [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period beginning from the grant date | 5 years |  |
Contractual term | 10 years |  |
Awards granted | shares | 0 | 0 | 0
SARs [Member] | Incentive Plan Stock Units Other [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period beginning from the grant date | 3 years |  |
Service condition awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense | $ 23,900,000 | $ 26,800,000 | $ 27,900,000
Unrecognized compensation cost on non-vested stock awards | $ 31,000,000 |  |
Unrecognized compensation cost on non-vested stock awards, weighted-average period of recognition | 1 year 9 months 18 days |  |
Weighted-average grant date fair value of SARs granted | $ / shares | $ 29.33 | $ 12.57 | $ 25.24
Total intrinsic value of awards exercised for options and SARs | $ 32,300,000 | $ 25,500,000 | $ 63,600,000
Performance condition awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense | 15,900,000 | $ 17,800,000 | $ 13,300,000
Unrecognized compensation cost on non-vested stock awards | $ 17,100,000 |  |
Unrecognized compensation cost on non-vested stock awards, weighted-average period of recognition | 1 year 7 months 6 days |  |
Weighted-average grant date fair value of SARs granted | $ / shares | $ 29.69 | $ 13.65 | $ 25.98
Total intrinsic value of awards exercised for options and SARs | $ 700,000 |  |
Market condition awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense | 400,000 | $ 300,000 | $ 0
Unrecognized compensation cost on non-vested stock awards | $ 500,000 |  |
Unrecognized compensation cost on non-vested stock awards, weighted-average period of recognition | 1 year 2 months 12 days |  |
Weighted-average grant date fair value of SARs granted | $ / shares |  | $ 9.87 |
Total intrinsic value of awards exercised for options and SARs | $ 0 | $ 11,400,000 | 0
Market and performance condition awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense | $ 0 | $ 0 | $ 4,500,000
Management Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Additional awards | shares | 0 |  |
2004 Stock Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Additional awards | shares | 0 |  |
2005 Stock Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Additional awards | shares | 0 |  |
Incentive Plan Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period beginning from the grant date | 3 years |  |
Contractual term | 3 years |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + 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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