Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator:
Net income	$ 2,009	$ 3,061	$ 27,585	$ 17,330
Less: Preferred stock dividends	(1,322)	(661)	(3,966)	(661)
Less: net income attributable to noncontrolling interest	(21)	(63)	(684)	(533)
Less: Net income attributable to participating securities	(80)	(70)	(327)	(223)
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS	586	2,267	22,608	15,913
Add back: Net income attributable to noncontrolling interests	21	63	684	533
Numerator for diluted net income attributable to common stockholders	$ 586	$ 2,330	$ 22,608	$ 15,913
Denominator:
Weighted average shares of common stock outstanding - basic (in shares)	72,621,219	65,707,476	68,984,047	61,694,835
Effect of dilutive securities - performance units (in shares)	446,862	286,697	380,808	225,141
Effect of dilutive securities - operating partnership units (in shares)	0	1,991,004	0	0
Weighted average shares of common stock outstanding - diluted (in shares)	73,068,081	67,985,177	69,364,855	61,919,976
Earnings per share — Basic
Net income attributable to common stockholders (in dollars per share)	$ 0.01	$ 0.03	$ 0.33	$ 0.26
Earnings per share — Diluted
Net income attributable to common stockholders (in dollars per share)	$ 0.01	$ 0.03	$ 0.33	$ 0.26