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Selected Quarterly Financial Data (Unaudited) - Selected Quarterly Financial Data (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2014
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Sep. 30, 2014
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Jun. 30, 2014
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Mar. 31, 2014
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Quarterly Financial Information Disclosure [Abstract] | |||||||||||
| Total Revenues | $ 67,928 | $ 65,604 | $ 67,120 | $ 62,542 | $ 59,152 | $ 59,578 | $ 62,493 | $ 59,289 | $ 263,194 | $ 240,512 | $ 228,059 |
| Income before Income Taxes | 3,076 | 2,377 | 3,723 | 547 | 3,363 | 2,096 | 2,254 | 2,117 | 9,723 | 9,830 | (9,045) |
| Net income | $ 21,968 | $ 2,120 | $ 3,469 | $ 511 | $ 3,158 | $ 1,932 | $ 2,066 | $ 2,024 | $ 28,068 | $ 9,180 | $ (9,040) |
| Basic and Diluted Net Income per Share | $ 0.54 | $ 0.05 | $ 0.08 | $ 0.01 | $ 0.07 | $ 0.05 | $ 0.05 | $ 0.05 | |||