Earnings per Share - Additional Information (Detail)
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3 Months Ended | 6 Months Ended | ||
---|---|---|---|---|
Jun. 30, 2013
Instruments
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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 |