Summary of Significant Accounting Policies - Reconciliation of Earnings Attributable to Common Shares Outstanding for the Basic and Diluted EPS (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Basic
Income from continuing operations									$ 16,821	$ 24,502	$ 11,398
Net (income) loss attributable to non-controlling interest									4,290	247	(814)
Preferred dividend of Series C Preferred Shares											(585)
Preferred dividend of Series D Preferred Shares									(11,146)	(9,285)	(339)
Income from continuing operations applicable to Common Shares									9,658	15,464	9,660
Income (loss) from discontinued operations									7,667	(118)	349
Net income attributable to Common Shares	(7,946)	8,835	5,490	10,943	(4,875)	12,322	571	7,328	17,325	15,346	10,009
Basic Weighted-Average Common Shares									33,743	33,062	31,428
Income from continuing operations	$ (0.22)	$ 0.27	$ 0.17	$ 0.33	$ (0.15)	$ 0.37	$ 0.02	$ 0.22	$ 0.28	$ 0.46	$ 0.31
Income (loss) from discontinued operations									$ 0.23		$ 0.01
Net income per Common Share - basic									$ 0.51	$ 0.46	$ 0.32
Diluted
Income from continuing operations									16,821	24,502	11,398
Net (income) loss attributable to non-controlling interest									4,290	247	(814)
Preferred dividend of Series C Preferred Shares											(585)
Preferred dividend of Series D Preferred Shares									(11,146)	(9,285)	(339)
Income from continuing operations applicable to Common Shares									9,658	15,464	9,660
Income (loss) from discontinued operations									7,667	(118)	349
Net income attributable to Common Shares	(7,946)	8,835	5,490	10,943	(4,875)	12,322	571	7,328	17,325	15,346	10,009
Stock options
Restricted Shares										1
Diluted Weighted-Average Common Shares									33,774	33,062	31,428
Income from continuing operations	$ (0.22)	$ 0.27	$ 0.17	$ 0.33	$ (0.15)	$ 0.37	$ 0.02	$ 0.22	$ 0.28	$ 0.46	$ 0.31
Income (loss) from discontinued operations									$ 0.23		$ 0.01
Net income per Common Share - diluted									$ 0.51	$ 0.46	$ 0.32
Restricted Stock [Member]
Basic
Amount allocated to Restricted Shares									(307)
Diluted
Amount allocated to Restricted Shares									$ (307)
Restricted Shares									31
Series B-1 [Member]
Diluted
Preferred Shares
Series C [Member]
Diluted
Preferred Shares