Annual report pursuant to section 13 and 15(d)

Selected Quarterly Financial Data (Unaudited) (Detail)

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Selected Quarterly Financial Data (Unaudited) (Detail) (USD $)
In Thousands, except 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
Revenue $ 17,157 $ 14,737 $ 14,472 $ 13,685 $ 14,144 $ 12,759 $ 12,907 $ 11,880 $ 60,051 $ 51,690 $ 42,787
Income before other income (expense), net 1,747 3,187 5,825 5,774 3,986 4,938 5,432 4,546 16,532 18,902 14,446
Net income 3,989 2,249 5,467 5,464 5,659 4,658 5,114 4,289 17,168 19,720 14,609
Net Income $ 2,026 $ 734             $ 13,690 $ 19,720 $ 14,609
Basic $ 0.32 $ 0.14 $ 0.53 $ 0.53 $ 0.54 $ 0.44 $ 0.49 $ 0.41 $ 1.68 $ 1.87 $ 1.46
Diluted $ 0.32 $ 0.14 $ 0.52 $ 0.52 $ 0.53 $ 0.44 $ 0.48 $ 0.40 $ 1.63 $ 1.84 $ 1.40
Basic 6,390,588 5,363,493 10,316,636 10,339,456 10,547,365 10,547,365 10,488,471 10,541,946 8,145,476 10,544,323 10,004,227
Diluted 6,390,588 5,363,493 10,553,725 10,576,545 10,693,816 10,693,816 10,634,922 10,799,746 8,374,025 10,690,775 10,443,317