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Stock Transactions and Unit Redemptions - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 09, 2018
Dec. 13, 2017
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Aug. 01, 2018
Class of Stock [Line Items]            
Stock repurchase program and unit redemption remaining authorized amount     $ 255,678      
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     $ 700 $ 5,300    
Weighted-average price per share     $ 4.04 $ 6.17    
Maximum [Member]            
Class of Stock [Line Items]            
Payment percentage of the gross proceeds from the sale of shares 2.00%          
Class B Common Stock [Member]            
Class of Stock [Line Items]            
Common stock, issued during the period     0 0    
Common stock outstanding     45,884,380   45,884,380  
Common stock, shares issued     45,884,000   45,884,000  
Common stock value issued     $ 459   $ 459  
Class A Common Stock [Member]            
Class of Stock [Line Items]            
Common stock, issued during the period     71,663 61,642    
Common stock outstanding     311,058,000   307,915,000  
Common stock, shares issued     361,583,000   358,440,000  
Common stock value issued     $ 3,616   $ 3,584  
Company's repurchase and additional redemption authority amount           $ 300,000
Stock repurchase program and unit redemption remaining authorized amount     $ 255,700      
Class A Common Stock [Member] | New CEO Program [Member]            
Class of Stock [Line Items]            
Maximum amount under the controlled equity offering program $ 300,000          
Common stock, shares issued     17,600,000      
Common stock value issued     $ 210,600