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Stock Transactions and Unit Redemptions - Additional Information (Detail) - USD ($)
 12 Months Ended
Mar. 09, 2018
Dec. 13, 2017
Apr. 12, 2017
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Aug. 01, 2018
Mar. 31, 2018
Class of Stock [Line Items]                
Payment percentage of the gross proceeds from the sale of shares 2.00%   2.00%          
Aggregate proceeds from issuance of common stock           $ 327,624,000    
Stock repurchase program and unit redemption remaining authorized amount       $ 249,908,000        
CF & Co [Member]                
Class of Stock [Line Items]                
Common stock, issued during the period       200,000 900,000      
Payment percentage of the gross proceeds from the sale of shares   5.50%            
Aggregate proceeds from issuance of common stock       $ 900,000 $ 5,300,000      
Weighted-average price per share       $ 4.11 $ 6.17      
Class B Common Stock [Member]                
Class of Stock [Line Items]                
Common stock, issued during the period       0 0      
Common stock outstanding       45,884,000 45,884,000      
Common stock, shares issued       45,884,000 45,884,000      
Common stock value issued       $ 459,000 $ 459,000      
Class A Common Stock [Member]                
Class of Stock [Line Items]                
Common stock, issued during the period       390,570 212,711 26,003,424    
Common stock outstanding       323,018,000 307,915,000      
Common stock, shares issued       373,545,000 358,440,000      
Common stock value issued       $ 3,735,000 $ 3,584,000      
Company's repurchase and additional redemption authority amount             $ 300,000,000.0  
Stock repurchase program and unit redemption remaining authorized amount       $ 249,900,000        
Class A Common Stock [Member] | CEO Program [Member]                
Class of Stock [Line Items]                
Maximum number of shares under the controlled equity offering     20,000,000          
Common stock, shares issued               20,000,000
Class A Common Stock [Member] | New CEO Program [Member]                
Class of Stock [Line Items]                
Payment percentage of the gross proceeds from the sale of shares 1.00%              
Common stock, shares issued       17,600,000        
Maximum amount under the controlled equity offering program $ 300,000,000.0              
Common stock value issued       $ 210,800,000