Quarterly report pursuant to Section 13 or 15(d)

Real Estate and Intangible Assets - Summary of Properties Acquired (Parenthetical) (Detail)

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Real Estate and Intangible Assets - Summary of Properties Acquired (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 1 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Nov. 30, 2005
Clintonville, WI [Member]
Sep. 30, 2013
Clintonville, WI [Member]
Apr. 30, 2013
Clintonville, WI [Member]
Business Acquisition [Line Items]            
Total Purchase Price $ 108,888 $ 58,065   $ 5,300 $ 3,250  
Total investment in property $ 622,481   $ 533,753     $ 8,600