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Stockholders' Equity - Summary of Unrecognized Compensation Cost (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
Restricted Stock [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unrecognized Compensation Costs $ 22.9
Weighted Average to be recognized 1 year 2 months 12 days
Restricted Stock Units (RSUs) [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unrecognized Compensation Costs $ 18.8
Weighted Average to be recognized 1 year 1 month 6 days