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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Parenthetical) (Detail) (Restricted Stock [Member], Non-employee directors [Member])
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12 Months Ended |
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Dec. 31, 2014
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Restricted Stock [Member] | Non-employee directors [Member]
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| Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] | |
| Restricted common stock issued, vesting period | 3 years |
| X | ||||||||||
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- Details
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| X | ||||||||||
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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