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Quarterly Financial Data (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 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
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Quarterly Information [Line Items]                        
Total revenue $ 4,688 $ 4,512 $ 4,041 $ 4,086 $ 3,990 $ 3,272 $ 3,222 $ 2,174   $ 16,629 $ 8,668 $ 5
Net income (loss) 340 49 (14) 239 153 (53) (65) (189) (63) 427 (370) 4
Net income (loss) allocable to common shares $ 4 $ (55) $ (28) $ (14) $ (26) $ (28) $ (48) $ 27 $ (63) $ (123) $ (112) $ 4
Total earnings (loss) per share-Basic $ 0.01 $ (0.19) [1] $ (0.09) [1] $ (0.04) [1] $ (0.21) [1] $ (1.40) [1] $ (2.40) [1] $ 1.35 [1] $ (3.16) [1] $ (0.45) $ (5.60) $ 0.20
Total earnings (loss) per share-Diluted $ 0.00 $ (0.19) [1] $ (0.09) [1] $ (0.04) [1] $ (0.21) [1] $ (1.40) [1] $ (2.40) [1] $ 1.35 [1] $ (3.16) [1] $ (0.45) $ (5.60) $ 0.20
[1] The summation of quarterly per share amounts do not equal the full year amounts.