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Stockholders' Equity - Additional Information (Details) - USD ($)
6 Months Ended
Apr. 12, 2018
Jun. 30, 2018
Class Of Stock [Line Items]    
Stock issued during period shares 5,405,000  
Shares issued price per share $ 37.50  
Gross proceeds from issuance of common stock $ 202,688,000  
Net proceeds after underwriting discounts and offering expenses $ 192,053,000 $ 192,053,000
Over-Allotment Option    
Class Of Stock [Line Items]    
Stock issued during period shares 705,000