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Quarterly Financial Data - Schedule of Consolidated Quarterly Financial Information (Detail) (USD $) | 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, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ 161,369,649 us-gaap_SalesRevenueServicesNet | $ 147,934,895 us-gaap_SalesRevenueServicesNet | $ 131,849,139 us-gaap_SalesRevenueServicesNet | $ 115,382,319 us-gaap_SalesRevenueServicesNet | $ 134,630,171 us-gaap_SalesRevenueServicesNet | $ 123,055,431 us-gaap_SalesRevenueServicesNet | $ 112,183,360 us-gaap_SalesRevenueServicesNet | $ 102,725,747 us-gaap_SalesRevenueServicesNet | $ 103,754,645 us-gaap_SalesRevenueServicesNet | $ 97,266,784 us-gaap_SalesRevenueServicesNet | $ 88,844,059 us-gaap_SalesRevenueServicesNet | $ 83,736,006 us-gaap_SalesRevenueServicesNet | $ 556,536,002 us-gaap_SalesRevenueServicesNet | $ 472,594,709 us-gaap_SalesRevenueServicesNet | $ 373,601,494 us-gaap_SalesRevenueServicesNet
Gross profit | 113,704,529 us-gaap_GrossProfit | 104,533,218 us-gaap_GrossProfit | 95,477,600 us-gaap_GrossProfit | 83,842,654 us-gaap_GrossProfit | 98,424,659 us-gaap_GrossProfit | 88,910,442 us-gaap_GrossProfit | 81,106,149 us-gaap_GrossProfit | 74,076,580 us-gaap_GrossProfit | 76,351,784 us-gaap_GrossProfit | 71,573,179 us-gaap_GrossProfit | 64,951,178 us-gaap_GrossProfit | 62,639,709 us-gaap_GrossProfit | 397,558,001 us-gaap_GrossProfit | 342,517,830 us-gaap_GrossProfit | 275,515,850 us-gaap_GrossProfit
Net Income (loss) | $ 34,161,329 us-gaap_NetIncomeLoss | $ 33,751,967 us-gaap_NetIncomeLoss | $ (25,588,478)us-gaap_NetIncomeLoss | $ 30,327,953 us-gaap_NetIncomeLoss | $ 40,836,407 us-gaap_NetIncomeLoss | $ 29,146,247 us-gaap_NetIncomeLoss | $ 30,021,018 us-gaap_NetIncomeLoss | $ 17,522,591 us-gaap_NetIncomeLoss | $ 30,246,388 us-gaap_NetIncomeLoss | $ 26,067,897 us-gaap_NetIncomeLoss | $ 25,394,824 us-gaap_NetIncomeLoss | $ 19,637,038 us-gaap_NetIncomeLoss | $ 72,580,551 us-gaap_NetIncomeLoss | $ 117,507,438 us-gaap_NetIncomeLoss | $ 101,247,298 us-gaap_NetIncomeLoss
Net Income (loss) per share-basic | $ 0.76 us-gaap_EarningsPerShareBasic | $ 0.76 us-gaap_EarningsPerShareBasic | $ (0.58)us-gaap_EarningsPerShareBasic | $ 0.69 us-gaap_EarningsPerShareBasic | $ 0.93 us-gaap_EarningsPerShareBasic | $ 0.66 us-gaap_EarningsPerShareBasic | $ 0.67 us-gaap_EarningsPerShareBasic | $ 0.40 us-gaap_EarningsPerShareBasic | $ 0.69 us-gaap_EarningsPerShareBasic | $ 0.59 us-gaap_EarningsPerShareBasic | $ 0.57 us-gaap_EarningsPerShareBasic | $ 0.45 us-gaap_EarningsPerShareBasic | $ 1.63 us-gaap_EarningsPerShareBasic | $ 2.66 us-gaap_EarningsPerShareBasic | $ 2.30 us-gaap_EarningsPerShareBasic
Net Income (loss) per share-diluted | $ 0.76 us-gaap_EarningsPerShareDiluted | $ 0.76 us-gaap_EarningsPerShareDiluted | $ (0.58)us-gaap_EarningsPerShareDiluted | $ 0.69 us-gaap_EarningsPerShareDiluted | $ 0.93 us-gaap_EarningsPerShareDiluted | $ 0.66 us-gaap_EarningsPerShareDiluted | $ 0.67 us-gaap_EarningsPerShareDiluted | $ 0.40 us-gaap_EarningsPerShareDiluted | $ 0.69 us-gaap_EarningsPerShareDiluted | $ 0.59 us-gaap_EarningsPerShareDiluted | $ 0.57 us-gaap_EarningsPerShareDiluted | $ 0.45 us-gaap_EarningsPerShareDiluted | $ 1.63 us-gaap_EarningsPerShareDiluted | $ 2.66 us-gaap_EarningsPerShareDiluted | $ 2.30 us-gaap_EarningsPerShareDiluted
Weighted average shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic | 44,154,412 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 44,153,892 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 44,153,892 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 44,153,818 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 44,153,185 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 44,152,933 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 44,152,933 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 44,151,323 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 44,150,920 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 44,150,387 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 44,147,999 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 44,142,076 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 44,153,884 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 44,152,600 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 44,147,861 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted | 44,154,412 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 44,153,892 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 44,182,668 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 44,153,818 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 44,153,185 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 44,152,933 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 44,152,933 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 44,151,357 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 44,152,895 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 44,157,321 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 44,152,133 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 44,147,796 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 44,153,884 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 44,152,600 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 44,149,838 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

X
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