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Summary Selected Quarterly Financial Data - Summary of Selected Consolidated 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 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 80,681 us-gaap_SalesRevenueServicesNet | $ 75,363 us-gaap_SalesRevenueServicesNet | $ 82,947 us-gaap_SalesRevenueServicesNet | $ 73,071 us-gaap_SalesRevenueServicesNet | $ 77,521 us-gaap_SalesRevenueServicesNet | $ 69,815 us-gaap_SalesRevenueServicesNet | $ 78,953 us-gaap_SalesRevenueServicesNet | $ 71,361 us-gaap_SalesRevenueServicesNet | $ 312,062 us-gaap_SalesRevenueServicesNet | $ 297,650 us-gaap_SalesRevenueServicesNet | $ 293,031 us-gaap_SalesRevenueServicesNet
Income from operations | 6,188 us-gaap_OperatingIncomeLoss | 4,925 us-gaap_OperatingIncomeLoss | 7,080 us-gaap_OperatingIncomeLoss | 20 us-gaap_OperatingIncomeLoss | 4,464 us-gaap_OperatingIncomeLoss | 4,301 us-gaap_OperatingIncomeLoss | 9,788 us-gaap_OperatingIncomeLoss | 3,280 us-gaap_OperatingIncomeLoss | 18,213 us-gaap_OperatingIncomeLoss | 21,833 us-gaap_OperatingIncomeLoss | 30,760 us-gaap_OperatingIncomeLoss
Net income | $ 3,599 us-gaap_NetIncomeLoss | $ 3,043 us-gaap_NetIncomeLoss | $ 4,289 us-gaap_NetIncomeLoss | $ (66)us-gaap_NetIncomeLoss | $ 2,161 us-gaap_NetIncomeLoss | $ 2,509 us-gaap_NetIncomeLoss | $ 6,185 us-gaap_NetIncomeLoss | $ 2,169 us-gaap_NetIncomeLoss | $ 10,865 us-gaap_NetIncomeLoss | $ 13,024 us-gaap_NetIncomeLoss | $ 26,296 us-gaap_NetIncomeLoss
Basic income per common share | $ 0.20 us-gaap_EarningsPerShareBasic | $ 0.17 us-gaap_EarningsPerShareBasic | $ 0.23 us-gaap_EarningsPerShareBasic |  | $ 0.11 us-gaap_EarningsPerShareBasic | $ 0.12 us-gaap_EarningsPerShareBasic | $ 0.29 us-gaap_EarningsPerShareBasic | $ 0.10 us-gaap_EarningsPerShareBasic | $ 0.58 us-gaap_EarningsPerShareBasic | $ 0.62 us-gaap_EarningsPerShareBasic | $ 1.17 us-gaap_EarningsPerShareBasic
Diluted income per common share | $ 0.19 us-gaap_EarningsPerShareDiluted | $ 0.16 us-gaap_EarningsPerShareDiluted | $ 0.23 us-gaap_EarningsPerShareDiluted |  | $ 0.11 us-gaap_EarningsPerShareDiluted | $ 0.12 us-gaap_EarningsPerShareDiluted | $ 0.28 us-gaap_EarningsPerShareDiluted | $ 0.10 us-gaap_EarningsPerShareDiluted | $ 0.57 us-gaap_EarningsPerShareDiluted | $ 0.61 us-gaap_EarningsPerShareDiluted | $ 1.15 us-gaap_EarningsPerShareDiluted

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