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Summary of Movement in Non-Vested Share Options (Detail) (Employee Stock Option, USD $) | 6 Months Ended
--- | ---
Jun. 30, 2013
Employee Stock Option |
Number of Shares |
Beginning Balance | 2,094,533
Granted | 253,650
Vested | (578,193)
Forfeited | (167,111)
Ending Balance | 1,602,879
Weighted Average Exercise Price |
Beginning balance | $ 22.43
Granted | $ 32.95
Vested | $ 24.83
Forfeited | $ 22.91
Ending balance | $ 23.18
Weighted Average Fair Value |
Beginning Balance | $ 9.17
Granted | $ 12.05
Vested | $ 9.82
Forfeited | $ 9.36
Ending Balance | $ 9.36

X
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