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Stock-Based Compensation Plans - Additional Information (Detail) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2014 | Jun. 30, 2015
Maximum |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Actual payout of shares on performance units granted |  | 150.00%
Minimum |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Actual payout of shares on performance units granted |  | 0.00%
Stock Appreciation Rights (SARs) |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Vesting period |  | 3 years
Stock Appreciation Rights (SARs) | Maximum |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Expiration term of stock units |  | 5 years
Performance Shares |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Vesting period | 3 years | 3 years
Restricted Stock |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Vesting period |  | 3 years

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- Definition Actual payout of shares on performance units granted. + References No definition available. + Details
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- 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
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- Definition 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. + References No definition available. + 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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