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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Net Income	$ 28	$ 8,700	$ 13,773	$ 20,570
Noncontrolling interests	(333)	(612)	(1,051)	(119)
Net (Loss) Income Attributable to Stockholders	(305)	8,088	12,722	20,451
Preferred stockholder dividends	(2,084)	0	(4,168)	0
Net (Loss) Income Attributable to Common Stockholders	$ (2,389)	$ 8,088	$ 8,554	$ 20,451
Shares:
Basic: Weighted-average number of shares outstanding (in shares)	7,064	8,170	6,804	8,257
Plus: Incremental shares from assumed conversion of dilutive instruments (in shares)	0	144	216	153
Diluted: Weighted-average number of shares outstanding (in shares)	7,064	8,314	7,020	8,410
(Loss) Earnings per share—Basic (in $ per share)	$ (0.34)	$ 0.99	$ 1.26	$ 2.48
(Loss) Earnings per Share—Diluted (in $ per share)	$ (0.34)	$ 0.97	$ 1.22	$ 2.43