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Rental Revenue (Detail) (USD $)
In Thousands, 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
Operating Leases, Income Statement, Lease Revenue [Abstract]                      
Base rents                 $ 51,252 $ 48,113 $ 46,916
Percentage rents                 330 333 397
Other                 5,938 5,990 5,265
Rental revenues $ 14,992 $ 14,899 $ 14,231 $ 13,398 $ 14,122 $ 13,318 $ 13,609 $ 13,387 $ 57,520 $ 54,436 $ 52,578