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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Parenthetical) (Detail) (Restricted Stock [Member], Non-employee directors [Member]) | 3 Months Ended
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Mar. 31, 2015
Restricted Stock [Member] | Non-employee directors [Member] |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |
Restricted common stock issued, vesting period | 3 years

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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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