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Stock-based Compensation - Schedule of Non-Vested RSUs (Detail) (RSUs [Member], USD $)
6 Months Ended
Jun. 30, 2013
RSUs [Member]
 
Nonvested Restricted Stock Units Activity [Line Items]  
Shares, Non-vested, beginning balance 2,345,000
Shares, Restricted stock granted 355,000
Shares, Restricted stock vested (408,000)
Shares, Restricted stock forfeited (188,000)
Shares, Non-vested, ending balance 2,104,000
Weighted average grant date fair value, Non-vested, beginning balance $ 15.26
Weighted average grant date fair value, Restricted stock granted $ 24.21
Weighted average grant date fair value, Restricted stock vested $ 15.08
Weighted average grant date fair value, Restricted stock forfeited $ 16.91
Weighted average grant date fair value, Non-vested, ending balance $ 16.66