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Stockholders' Equity - Schedule of Restricted Stock Unit Activity (Detail) - Restricted Stock Units (RSUs) [Member] - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Shares, Unvested at December 31, 2014 433    
Number of Shares, Granted 258    
Number of Shares, Vested (134)    
Number of Shares, Forfeited (53)    
Number of Shares, Unvested at December 31, 2015 504 433  
Weighted-Average Grant Date Fair Value, Unvested, Beginning Balance $ 35.64    
Weighted average grant date fair value for RSUs granted 31.50 $ 36.67 $ 34.58
Weighted-Average Grant Date Fair Value, Vested or settled 35.30    
Weighted-Average Grant Date Fair Value, Forfeited 35.12    
Weighted-Average Grant Date Fair Value , Unvested, Ending Balance $ 33.67 $ 35.64