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Stockholders' Equity (Detail) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended			9 Months Ended
	Sep. 14, 2016	Jun. 17, 2016	Mar. 15, 2016	Sep. 30, 2016	Sep. 30, 2015	Mar. 31, 2015	Sep. 30, 2016	Sep. 30, 2015	Jun. 30, 2015
Class of Stock [Line Items]
Proceeds from issuance of common stock as a result of follow-on public offering						$ 193,148
Dividend declared per share of common stock (in dollars per share)				$ 0.46	$ 0.44		$ 1.38	$ 1.32
Common Stock [Member]
Class of Stock [Line Items]
Dividend declared per share of common stock (in dollars per share)	$ 0.46	$ 0.46	$ 0.46
Series A Preferred Stock [Member]
Class of Stock [Line Items]
Dividend rate, preferred stock							8.625%
Dividend declared per share of preferred stock (in dollars per share)	0.5391	0.5391	0.5391
Series B Preferred Stock [Member]
Class of Stock [Line Items]
Dividend rate, preferred stock							8.00%
Dividend declared per share of preferred stock (in dollars per share)	0.5000	$ 0.5000	$ 0.50
Series C Preferred Stock [Member]
Class of Stock [Line Items]
Dividend rate, preferred stock							8.00%
Dividend declared per share of preferred stock (in dollars per share)	$ 0.5000
Follow On Public Offering [Member] | Common Stock [Member]
Class of Stock [Line Items]
New issuance of stock (shares)						11,500,000
Price per share of newly issued stock (in dollars per share)									$ 16.82

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