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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net Income (Loss)	$ 23,229	$ 28	$ 47,056	$ 13,773
Noncontrolling interests	(159)	(333)	(686)	(1,051)
Net Income (Loss) Attributable to Stockholders	23,070	(305)	46,370	12,722
Preferred stockholder dividends	(2,084)	(2,084)	(4,168)	(4,168)
Net Income (Loss) Attributable to Common Stockholders	$ 20,986	$ (2,389)	$ 42,202	$ 8,554
Shares:
Basic: Weighted-average number of common shares outstanding (in shares)	7,211	7,064	7,204	6,804
Plus: Incremental shares from assumed conversion of dilutive instruments (in shares)	1,190	0	1,192	216
Diluted: Weighted-average number of common shares outstanding (in shares)	8,401	7,064	8,396	7,020
Earnings (Loss) per share—Basic (in $ per share)	$ 2.91	$ (0.34)	$ 5.86	$ 1.26
Earnings (Loss) per Share—Diluted (in $ per share)	$ 2.75	$ (0.34)	$ 5.52	$ 1.22