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Summary of Restricted Stock Units Activity (Detail) - Restricted Stock Units (RSUs)
shares in Thousands
12 Months Ended
Dec. 31, 2015
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding at beginning of year 802
Granted 373
Vested (268)
Forfeited (95)
Outstanding as of December 31, 812