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Earnings Per Share - Common Shares Related to Stock Options and RSUs Excluded from Calculated Diluted Net Income Per Share (Parenthetical) (Detail) | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Performance based options, bearing right to acquire common stock | 210,000 |
Restricted stock units, bearing right to acquire common stock | 254,000 |
Restricted Stock Units (RSUs) [Member] |  |
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Restricted stock units, bearing right to acquire common stock |  | 400,000
Restricted stock units, bearing right to acquire common stock | 44,000 |

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- Details
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- Definition Performance based options, number of securities called by options. + References No definition available. + Details
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- Definition Total performance based awards called by restricted stock units and options. + References No definition available. + Details
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- Definition Performance based restricted stock units, number of securities called by restricted stock units. + References No definition available. + Details
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