Stockholders' Equity - Summary of Dividend Distributions (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Class of Stock [Line Items]
Total Common Dividend/ Distribution	$ 38,862
Total Preferred Dividend/ Distribution	8,733		18,947		19,565
Common Class A [Member]
Class of Stock [Line Items]
Total Common Dividend/ Distribution	38,862	[1]	0	[1]	0
Series F Preferred Stock
Class of Stock [Line Items]
Total Preferred Dividend/ Distribution	2,896	[1]	2,728	[1]	3,256
Series G Preferred Stock [Member]
Class of Stock [Line Items]
Total Preferred Dividend/ Distribution	1,809	[1]	1,809	[1]	1,809
Series J Preferred Stock [Member]
Class of Stock [Line Items]
Total Preferred Dividend/ Distribution	2,034	[1]	10,785	[1]	10,875
Series K Preferred Stock [Member]
Class of Stock [Line Items]
Total Preferred Dividend/ Distribution	$ 1,994	[1]	$ 3,625	[1]	$ 3,625

[1] The second quarter 2013 and fourth quarter 2012 dividend per share related to redeemed Series J Preferred Stock was pro-rated as discussed in the "Preferred Stock" section. The third quarter 2013 dividend per share related to redeemed Series K Preferred Stock was pro-rated as discussed in the "Preferred Stock" section.