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Earnings Per Share - Additional Information (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2019
shares
Sep. 30, 2019
Vote
shares
Sep. 30, 2018
shares
Earnings Per Share Basic [Line Items]      
Conversion of stock, description   Each share of Class B common stock is convertible into one share of Class A common stock at the option of the holder at any time or automatically upon certain events described in the Company’s amended and restated certificate of incorporation, including on either the death or voluntary termination of the Company’s Chief Executive Officer.  
Undistributed earnings ratio used to calculate allocation to class of stock   100.00%  
Class A Common Stock      
Earnings Per Share Basic [Line Items]      
Right to voting   one vote per share  
Number of votes entitled to stockholders per share | Vote   1  
Conversion of stock | shares 200,000 200,000 7,534,710
Class B Common Stock      
Earnings Per Share Basic [Line Items]      
Right to voting   ten votes per share  
Number of votes entitled to stockholders per share | Vote   10  
Class of share converted to another class   one share of Class A common stock  
Conversion of stock | shares   1