Description of Operations and Formation - Additional Information (Detail) (USD $)	0 Months Ended		1 Months Ended	3 Months Ended		9 Months Ended					1 Months Ended	9 Months Ended		0 Months Ended
	Apr. 15, 2013	Mar. 07, 2013	Sep. 30, 2010	Sep. 30, 2014 Property	Sep. 30, 2013	Sep. 30, 2014 Segment Property	Sep. 30, 2013	Dec. 31, 2013	Mar. 25, 2013	Mar. 07, 2013	Sep. 30, 2010 Common Stock	Sep. 30, 2014 Common Stock	Dec. 31, 2013 Common Stock	Mar. 26, 2013 IPO	Mar. 26, 2013 IPO
Consolidation And Basis Of Presentation [Line Items]
Directly or indirectly owned or leased properties across the United States				313		313
Number of wholly owned subsidiaries						5
Authorized shares of common stock				300,000,000		300,000,000
Common stock, par value				$ 0.01		$ 0.01		$ 0.01
Authorized shares of preferred stock				25,000,000		25,000,000
Preferred stock, par value				$ 0.01		$ 0.01
Stock issued (in shares)			13,200,000			8,500,000								15,180,000
Net proceeds from issuance of shares						$ 221,720,000	$ 303,600,000				$ 235,000,000	$ 159,000,000
Increase in the number of authorized REIT shares										300,000,000
Common stock shares, split ratio		60.37
Shares issued under underwritten public offering				47,216,963		47,216,963		37,593,910							15,200,000
Net proceeds, before expenses														$ 282,300,000
Shares sold to underwriters															2,000,000
Offering price per share															$ 20.00
Common stock, shares outstanding				47,216,963		47,216,963		37,593,910	21,700,000			47,216,963	37,593,910
Operating Partnership unit				11,400,000		11,400,000			11,900,000
Preferred stock, shares outstanding									125
Preferred stock, redeemed	125
Ownership of Partnership				80.50%		80.50%		76.40%
Weighted average				80.52%	79.15%	75.70%	73.10%