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Summary of Significant Accounting Policies - Common Stock and Convertible Stock Dilutive in Weighted average unearned PSUs outstanding (Detail) - $ / shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Accounting Policies [Abstract]        
Weighted average PSUs (in shares) 1,136 862 1,014 513
Weighted average grant date fair value per unit (in dollars per share) $ 9.33 $ 9.60 $ 9.33 $ 9.60