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Stock-Based Compensation - Summary of Nonvested Restricted Shares and Restricted Stock Units (Detail) - Restricted Shares and Restricted Stock Units (RSU's) [Member] - 2011 Equity Incentive Plan [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]      
Nonvested Shares, beginning balance 1,194    
Granted, Shares 441 500 706
Vested, Shares (125)    
Forfeited, Shares (264)    
Nonvested Shares, ending balance 1,246 1,194  
Nonvested, Weighted Average Grant-Date Fair Value, beginning balance $ 16.80    
Granted, Weighted Average Grant-Date Fair Value 25.06 $ 19.77 $ 15.25
Vested, Weighted Average Grant-Date Fair Value 16.10    
Forfeited or expired, Weighted Average Grant-Date Fair Value 15.71    
Nonvested, Weighted Average Grant-Date Fair Value, ending balance $ 20.03 $ 16.80