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Earnings per Share - Schedule of Computation of Basic and Diluted Earnings per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share [Abstract]    
Net Income (Loss) $ 23,827 $ 13,745
Noncontrolling interests (527) (718)
Net Income (Loss) Attributable to Stockholders 23,300 13,027
Preferred stockholder dividends (2,084) (2,084)
Net Income (Loss) Attributable to Common Stockholders $ 21,216 $ 10,943
Shares:    
Basic: Weighted-average number of common shares outstanding (in shares) 7,197 6,542
Plus: Incremental shares from assumed conversion of dilutive instruments (in shares) 1,214 231
Diluted: Weighted-average number of common shares outstanding (in shares) 8,411 6,773
Earnings (Loss) per share—Basic (in $ per share) $ 2.95 $ 1.67
Earnings (Loss) per Share—Diluted (in $ per share) $ 2.77 $ 1.62