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, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Net Income	$ 13,745	$ 11,870
Noncontrolling interests	(718)	493
Net Income Attributable to Stockholders	13,027	12,363
Preferred stockholder dividends	(2,084)	0
Net Income Attributable to Common Stockholders	$ 10,943	$ 12,363
Shares:
Basic: Weighted-average number of shares outstanding (in shares)	6,542	8,344
Plus: Incremental shares from assumed conversion of dilutive instruments (in shares)	231	162
Diluted: Weighted-average number of shares outstanding (in shares)	6,773	8,506
Earnings per share—Basic (in $ per share)	$ 1.67	$ 1.48
Earnings per Share—Diluted (in $ per share)	$ 1.62	$ 1.45