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Reconciliation of Basic and Diluted Earnings (Loss) Per Share (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net income (loss) $ 302 $ 49 $ (14) $ 239 $ 153 $ (53) $ (65) $ (189) $ (63) $ 966 $ 378 $ 427 $ (370) $ 4
(Income) loss allocated to preferred shares (2)   (4)             (10) (12)      
(Income) loss allocated to non-controlling interests (45)   (10)             (649) (434)      
Net income (loss) allocable to common shares $ 255 $ (55) $ (28) $ (14) $ (26) $ (28) $ (48) $ 27 $ (63) $ 307 $ (68) $ (123) $ (112) $ 4
Weighted-average shares outstanding-Basic 7,643,540   324,359             3,875,331 256,883 275,384 20,000 20,000
Weighted-average shares outstanding-Diluted 7,643,540   324,359             3,875,331 256,883 275,384 20,000 20,000
Earnings (loss) per share-Basic $ 0.03 $ (0.19) [1] $ (0.09) [1] $ (0.04) [1] $ (0.21) [1] $ (1.40) [1] $ (2.40) [1] $ 1.35 [1] $ (3.16) [1] $ 0.08 $ (0.26) $ (0.45) $ (5.60) $ 0.20
Earnings (loss) per share-Diluted $ 0.03 $ (0.19) [1] $ (0.09) [1] $ (0.04) [1] $ (0.21) [1] $ (1.40) [1] $ (2.40) [1] $ 1.35 [1] $ (3.16) [1] $ 0.08 $ (0.26) $ (0.45) $ (5.60) $ 0.20
[1] The summation of quarterly per share amounts do not equal the full year amounts.