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Quarterly Financial Data (Detail) (USD $)
In Thousands, except Per Share data, 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
Quarterly Information [Line Items]                      
Total revenue $ 5,768 $ 4,787 $ 4,700 $ 4,688 $ 4,512 $ 4,041 $ 4,086 $ 3,990 $ 19,943 $ 16,629 $ 8,668
Net income (loss) 308 302 324 340 49 (14) 239 153 1,274 427 (370)
Net income (loss) allocable to common shares $ 308 $ 255 $ 48 $ 4 $ (55) $ (28) $ (14) $ (26) $ 615 $ (123) $ (112)
Total earnings (loss) per share-Basic $ 0.03 [1] $ 0.03 [1] $ 0.01 [1] $ 0.01 [1] $ (0.19) [1] $ (0.09) [1] $ (0.04) [1] $ (0.21) [1] $ 0.12 $ (0.45) $ (5.60)
Total earnings (loss) per share-Diluted $ 0.03 [1] $ 0.03 [1] $ 0.01 [1] $ 0.00 [1] $ (0.19) [1] $ (0.09) [1] $ (0.04) [1] $ (0.21) [1] $ 0.12 $ (0.45) $ (5.60)
[1] The summation of quarterly per share amounts do not equal the full year amounts.