XML 65 R118.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Employee Benefit Plans - Additional Information (Detail) In Millions, except Share data, unless otherwise specified | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended |  |  |  |  |  | 12 Months Ended |  | 12 Months Ended |  |  |  | 12 Months Ended |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2013 Continuing operations USD ($) | Dec. 31, 2012 Continuing operations USD ($) | Dec. 31, 2011 Continuing operations USD ($) | Dec. 31, 2013 Discontinued operations USD ($) | Dec. 31, 2012 Discontinued operations USD ($) | Dec. 31, 2011 Discontinued operations USD ($) | Dec. 31, 2013 Performance Shares USD ($) | Dec. 31, 2012 Performance Shares | Dec. 31, 2013 Stock Appreciation Rights ZAR | Dec. 31, 2012 Stock Appreciation Rights ZAR | Dec. 31, 2011 Stock Appreciation Rights ZAR | Dec. 31, 2013 Restricted Stock | Dec. 31, 2013 Bonus Shares | Dec. 31, 2012 Bonus Shares | Dec. 31, 2013 2005 Share Plan USD ($) | Dec. 31, 2013 2005 Share Plan ZAR | Dec. 31, 2012 2005 Share Plan USD ($) | Dec. 31, 2012 2005 Share Plan ZAR | Dec. 31, 2011 2005 Share Plan USD ($) | Dec. 31, 2011 2005 Share Plan ZAR | Dec. 31, 2010 2005 Share Plan USD ($) | Dec. 31, 2010 2005 Share Plan ZAR | Dec. 31, 2013 2005 Share Plan Stock Appreciation Rights USD ($) | Dec. 31, 2013 2005 Share Plan Stock Appreciation Rights ZAR | Dec. 31, 2012 2005 Share Plan Stock Appreciation Rights USD ($) | Dec. 31, 2012 2005 Share Plan Stock Appreciation Rights ZAR | Dec. 31, 2011 2005 Share Plan Stock Appreciation Rights ZAR | Dec. 31, 2010 2005 Share Plan Stock Appreciation Rights | Dec. 31, 2013 2005 Share Plan Stock Appreciation Rights Maximum | Dec. 31, 2013 2005 Share Plan Restricted Stock | Dec. 31, 2012 2005 Share Plan Restricted Stock | Dec. 31, 2011 2005 Share Plan Restricted Stock | Dec. 31, 2010 2005 Share Plan Restricted Stock | Dec. 31, 2013 GF Management Incentive Scheme | Dec. 31, 2013 GF Management Incentive Scheme | Dec. 31, 2012 GF Management Incentive Scheme USD ($) | Dec. 31, 2012 GF Management Incentive Scheme ZAR | Dec. 31, 2013 GF Management Incentive Scheme Maximum ZAR | Dec. 31, 2013 GF Management Incentive Scheme Minimum ZAR | Dec. 31, 2013 The Gold Fields Limited 2012 Share Plan Performance Shares | Dec. 31, 2013 The Gold Fields Limited 2012 Share Plan Performance Shares Continuing operations USD ($) | Dec. 31, 2012 The Gold Fields Limited 2012 Share Plan Performance Shares Continuing operations USD ($) | Dec. 31, 2011 The Gold Fields Limited 2012 Share Plan Performance Shares Continuing operations USD ($) | Dec. 31, 2013 The Gold Fields Limited 2012 Share Plan Performance Shares Discontinued operations USD ($) | Dec. 31, 2012 The Gold Fields Limited 2012 Share Plan Performance Shares Discontinued operations USD ($) | Dec. 31, 2011 The Gold Fields Limited 2012 Share Plan Performance Shares Discontinued operations USD ($) | Dec. 31, 2013 The Gold Fields Limited 2012 Share Plan Bonus Shares Maximum | Dec. 31, 2013 The Gold Fields Limited 2012 Share Plan Bonus Shares Minimum | Dec. 31, 2013 The Gold Fields Limited 2012 Share Plan Bonus Shares Continuing operations USD ($) | Dec. 31, 2012 The Gold Fields Limited 2012 Share Plan Bonus Shares Continuing operations USD ($) | Dec. 31, 2011 The Gold Fields Limited 2012 Share Plan Bonus Shares Continuing operations USD ($) | Dec. 31, 2013 The Gold Fields Limited 2012 Share Plan Bonus Shares Discontinued operations USD ($) | Dec. 31, 2012 The Gold Fields Limited 2012 Share Plan Bonus Shares Discontinued operations USD ($) | Dec. 31, 2011 The Gold Fields Limited 2012 Share Plan Bonus Shares Discontinued operations USD ($) | Dec. 31, 2013 The GF Non Executive Director Share Plan | Dec. 31, 2012 The GF Non Executive Director Share Plan | Dec. 31, 2011 The GF Non Executive Director Share Plan USD ($) | Dec. 31, 2011 The GF Non Executive Director Share Plan ZAR | Dec. 31, 2010 The GF Non Executive Director Share Plan USD ($) | Dec. 31, 2010 The GF Non Executive Director Share Plan ZAR
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of providing retirement benefits for defined contribution plans |  |  |  | $ 32.3 | $ 30.0 | $ 22.0 | $ 32.3 | $ 62.8 | $ 65.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation allocation expense | 40.5 | 45.5 | 33.4 | 40.5 | 45.5 | 33.4 | 4.6 | 32.2 | 33.0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18.8 | 13.1 |  | 1.1 | 7.6 |  |  |  | 11.9 | 8.7 |  | 0.8 | 5.0 |  |  |  |  |  |  |
Incremental share-based compensation resulting from this modification | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share vesting period |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  | 3 years | 3 years |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Internal target performance percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance shares settlement increased percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bonus share settlement period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18 months | 9 months |  |  |  |  |  |  |  |  |  |  |  |
Valuation method |  |  |  |  |  |  |  |  |  | The Group uses the Monte-Carlo Simulation to value the Performance Shares. |  | The Group used the Black Scholes Model to value the SARS under the Gold Fields 2005 Share Plan. |  |  | The Group used the Monte-Carlo Simulation to value the PVRS under the Gold Fields 2005 Share Plan and the Gold Fields Limited 2005 Non-executive Share Plan. | A future trading model is used to estimate the loss in value to the holders of Bonus Shares due to trading restrictions. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options exercisable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration period from grant date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 years |  |  |  |  |  |  |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding, average exercise price |  |  |  |  |  |  |  |  |  |  |  |  |  | 119.17 |  |  |  | $ 8.89 | 91.91 | $ 12.53 | 107.37 | $ 13.27 | 107.91 | $ 15.63 | 105.53 | $ 8.89 | 91.91 | $ 12.53 | 107.37 |  |  |  |  |  |  |  |  |  | $ 10.09 | 86.51 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11.76 | 79.37
Shares vested |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,095,543 | 2,095,543 | 1,605,403 | 1,605,403 | 1,199,703 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares vested average instrument price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85.97 |  | 110.07 | 112.85 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options to purchase ordinary shares, outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 75,500 | 75,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option exercising term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Each option may normally only be exercised by a participant on the following bases: (1) after two years have elapsed from the date on which the option was accepted by the participant, in respect of not more than one-third of the ordinary shares which are the subject of that option; (2) after three years have elapsed from the date on which the option was accepted by the participant, in respect of not more than a further one-third (representing two-thirds cumulatively) of the ordinary shares which are the subject of that option; and (3) after four years have elapsed from the date on which the option was accepted by the participant, in respect of all the ordinary shares which are the subject of that option, subject to revision by the Board of Directors. | Each option may normally only be exercised by a participant on the following bases: (1) after two years have elapsed from the date on which the option was accepted by the participant, in respect of not more than one-third of the ordinary shares which are the subject of that option; (2) after three years have elapsed from the date on which the option was accepted by the participant, in respect of not more than a further one-third (representing two-thirds cumulatively) of the ordinary shares which are the subject of that option; and (3) after four years have elapsed from the date on which the option was accepted by the participant, in respect of all the ordinary shares which are the subject of that option, subject to revision by the Board of Directors. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued ordinary share capital reserved for issuance under all share schemes, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares reserved for issuance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,309,563 | 35,309,563 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Market price of options exercised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 106.87 | 53.03 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options outstanding |  |  |  |  |  |  |  |  |  | 6,029,716 | 4,262,170 |  |  |  |  | 882,072 | 792,376 |  |  |  |  |  |  |  |  | 3,151,728 | 3,151,728 | 4,318,909 | 4,318,909 | 5,030,143 | 5,270,597 |  | 1,230,971 | 4,986,216 | 7,369,112 | 7,650,081 |  |  | 75,500 | 75,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  | 36,700 | 36,700
Compensation cost related to awards not yet recognized under all four schemes | $ 40.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation cost related to awards not yet recognized under all four schemes, period of recognition | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Market prices of shares for which options were exercised during the year. + References No definition available. + Details
Name: | gfi_MarketPricesOfSharesForWhichOptionsWereExercisedDuringYear
Namespace Prefix: | gfi_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Option To Purchase Common Shares Outstanding + References No definition available. + Details
Name: | gfi_OptionToPurchaseCommonSharesOutstanding
Namespace Prefix: | gfi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Share Based Compensation Arrangement By Award Options And Stock Settled Appreciation Rights Award Vesting Period + References No definition available. + Details
Name: | gfi_ShareBasedCompensationArrangementByAwardOptionsAndStockSettledAppreciationRightsAwardVestingPeriod
Namespace Prefix: | gfi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The maximum percentage of shares to the Company's issued ordinary shares 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 percentage remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References No definition available. + Details
Name: | gfi_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfSharesAuthorizedForGrant
Namespace Prefix: | gfi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share Based Compensation Arrangement By Share Based Payment Award Shares Settled As Percentage Of Outstanding Amount + References No definition available. + Details
Name: | gfi_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesSettledAsPercentageOfOutstandingAmount
Namespace Prefix: | gfi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Share Based Compensation Arrangement By Share Based Payment Award Target Percentage + References No definition available. + Details
Name: | gfi_ShareBasedCompensationArrangementByShareBasedPaymentAwardTargetPercentage
Namespace Prefix: | gfi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- 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 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
Name: | us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Unrecognized cost of unvested share-based compensation awards. + 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
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition For each plan, identification of the award pricing model or other valuation method used in calculating the weighted average fair values disclosed. The model is also used to calculate the compensation expense that is shown within the balance sheet, income statement, and cash flow. Examples of valuation techniques are lattice models (binomial model), closed-form models (Black-Scholes-Merton formula), and a Monte Carlo simulation technique. Fair value is the amount at which an asset or liability could be bought or incurred or sold or settled in a current transaction between willing parties, that is, other than in a forced or liquidation sale. May include disclosures about the assumptions underlying application of the method selected. + 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 (f)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsMethodUsed
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- 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
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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 (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of options vested. + References No definition available. + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition An excess of the fair value of the modified award over the fair value of the award immediately before the modification. + 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 (h)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Description of pertinent provisions of equity-based compensation awards that have actual or potential impact upon the company's financial statements. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardTermsOfAward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration