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Stockholders' Equity - Additional Information (Detail)
3 Months Ended
Mar. 31, 2019
USD ($)
shares
Stockholders Equity [Line Items]  
Unrecognized compensation costs related to unvested stock options, restricted stock units (RSUs) and performance share units (PSUs) $ 71,600,000
Recognition period of unrecognized compensation expense 1 year 7 months 6 days
Capitalized equity-based compensation costs $ 0
Projected dividend yield 0.00%
Stock Options [Member]  
Stockholders Equity [Line Items]  
Vesting period, year 3 years
Contractual term 10 years
Non Qualified Stock Option [Member]  
Stockholders Equity [Line Items]  
Stock option awards granted | shares 0
Restricted Stock Units (RSUs) [Member] | Minimum [Member]  
Stockholders Equity [Line Items]  
Vesting period, year 1 year
Restricted Stock Units (RSUs) [Member] | Maximum [Member]  
Stockholders Equity [Line Items]  
Vesting period, year 3 years
Performance Shares [Member]  
Stockholders Equity [Line Items]  
Vesting period, year 3 years
Performance Shares [Member] | Minimum [Member]  
Stockholders Equity [Line Items]  
Number of shares issued on performance 0.00%
Performance Shares [Member] | Maximum [Member]  
Stockholders Equity [Line Items]  
Number of shares issued on performance 200.00%