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Acquisition - Unaudited Pro Forma Financial Information (Detail) - BRMR and Everest Merger Sub Inc. [Member] - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]    
Pro forma total revenues $ 677,099 $ 698,850
Pro forma net income $ 44,536 $ 5,919
Pro forma net income per share (basic) $ 1.25 $ 0.17
Pro forma net income per share (diluted) $ 1.24 $ 0.16