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Earnings per Share - Additional Information (Detail) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2013 Instruments | Jun. 30, 2012 Instruments | Jun. 30, 2013 Instruments | Jun. 30, 2012 Instruments
Earnings Per Share [Abstract] |  |  |  |
Number of anti-dilutive instruments excluded from computation of weighted average shares for diluted EPS | 0 | 0 | 0 | 0

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- Details
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- Definition Number Of Antidilutive Securities Excluded From Computation Of Earnings Per Share + References No definition available. + Details
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