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		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net Income (Loss)	$ 20,523	$ 16,276	$ 34,296	$ 36,846
Noncontrolling interests	(1,731)	(651)	(2,782)	(770)
Net Income (Loss) Attributable to Stockholders	18,792	15,625	31,514	36,076
Preferred stockholder dividends	(2,084)	0	(6,252)	0
Net Income (Loss) Attributable to Common Stockholders	$ 16,708	$ 15,625	$ 25,262	$ 36,076
Shares:
Basic: Weighted-average number of shares outstanding (in shares)	7,212	7,676	6,942	8,062
Plus: Incremental shares from assumed conversion of dilutive instruments (in shares)	1,280	178	226	161
Diluted: Weighted-average number of shares outstanding (in shares)	8,492	7,854	7,168	8,223
Earnings (Loss) per share—Basic (in $ per share)	$ 2.32	$ 2.04	$ 3.64	$ 4.47
Earnings (Loss) per Share—Diluted (in $ per share)	$ 2.21	$ 1.99	$ 3.52	$ 4.39