Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Information (Detail)

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Quarterly Financial Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
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 Financial Information [Line Items]                      
Total revenue $ 60,550 $ 56,719 $ 57,626 $ 54,284 $ 57,060 $ 54,503 $ 55,440 $ 51,163      
Operating income (loss) 10,219 8,479 3,862 7,930 10,875 9,286 9,920 11,918 30,490 41,999 36,633
Net income (loss) before discontinued operations 2,010 3,407 (1,779) 885 1,026 1,689 1,085 2,559 (95) (741) (44)
Net income (loss) $ 2,009 $ 3,368 $ (1,792) $ 843 $ 446 $ 1,485 $ 1,100 $ 2,587 $ 4,428 $ 5,618 $ 1,932
Basic earnings (loss) per share $ 0.08 $ 0.14 $ (0.07) $ 0.04 $ 0.04 $ 0.07 $ 0.04 $ 0.10 $ 0.18 $ 0.23 $ 0.08
Basic earnings (loss) per share from continuing operations $ 0.08 $ 0.13 $ (0.07) $ 0.03 $ 0.02 $ 0.06 $ 0.05 $ 0.11 $ 0.18 $ 0.26 $ 0.08
Diluted earnings (loss) per share $ 0.08 $ 0.14 $ (0.07) $ 0.04 $ 0.04 $ 0.07 $ 0.04 $ 0.10 $ 0.18 $ 0.23 $ 0.08
Diluted earnings (loss) per share from continuing operations $ 0.08 $ 0.13 $ (0.07) $ 0.03 $ 0.02 $ 0.06 $ 0.04 $ 0.10 $ (0.18) $ (0.26) $ (0.08)
Weighted average shares outstanding - basic 24,726,148 24,663,027 24,356,298 24,564,947 24,554,245 24,546,056 24,279,251 24,520,858 24,577,605 24,475,102 24,086,829
Weighted average shares outstanding - diluted 25,266,368 25,358,052 24,356,298 24,753,671 24,737,629 24,746,164 24,491,530 24,759,253 24,986,966 24,683,644 24,653,465