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Stock-Based Awards - Summary of Restricted Shares Outstanding (Detail) (Restricted Stock Units (RSUs) [Member])
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restricted Stock Units (RSUs) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock awards, beginning balance 1,281,144 1,311,371 2,158,509
Granted 981,810 1,209,114 561,526
Vested (358,334) (1,209,121) (1,382,376)
Forfeited (7,743) (30,220) (26,288)
Restricted stock awards, ending balance 1,896,877 1,281,144 1,311,371