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Quarterly Financial Data - Schedule of Consolidated Quarterly Financial Information (Detail) (USD $)	3 Months Ended												12 Months Ended
	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	$ 161,369,649us-gaap_SalesRevenueServicesNet	$ 147,934,895us-gaap_SalesRevenueServicesNet	$ 131,849,139us-gaap_SalesRevenueServicesNet	$ 115,382,319us-gaap_SalesRevenueServicesNet	$ 134,630,171us-gaap_SalesRevenueServicesNet	$ 123,055,431us-gaap_SalesRevenueServicesNet	$ 112,183,360us-gaap_SalesRevenueServicesNet	$ 102,725,747us-gaap_SalesRevenueServicesNet	$ 103,754,645us-gaap_SalesRevenueServicesNet	$ 97,266,784us-gaap_SalesRevenueServicesNet	$ 88,844,059us-gaap_SalesRevenueServicesNet	$ 83,736,006us-gaap_SalesRevenueServicesNet	$ 556,536,002us-gaap_SalesRevenueServicesNet	$ 472,594,709us-gaap_SalesRevenueServicesNet	$ 373,601,494us-gaap_SalesRevenueServicesNet
Gross profit	113,704,529us-gaap_GrossProfit	104,533,218us-gaap_GrossProfit	95,477,600us-gaap_GrossProfit	83,842,654us-gaap_GrossProfit	98,424,659us-gaap_GrossProfit	88,910,442us-gaap_GrossProfit	81,106,149us-gaap_GrossProfit	74,076,580us-gaap_GrossProfit	76,351,784us-gaap_GrossProfit	71,573,179us-gaap_GrossProfit	64,951,178us-gaap_GrossProfit	62,639,709us-gaap_GrossProfit	397,558,001us-gaap_GrossProfit	342,517,830us-gaap_GrossProfit	275,515,850us-gaap_GrossProfit
Net Income (loss)	$ 34,161,329us-gaap_NetIncomeLoss	$ 33,751,967us-gaap_NetIncomeLoss	$ (25,588,478)us-gaap_NetIncomeLoss	$ 30,327,953us-gaap_NetIncomeLoss	$ 40,836,407us-gaap_NetIncomeLoss	$ 29,146,247us-gaap_NetIncomeLoss	$ 30,021,018us-gaap_NetIncomeLoss	$ 17,522,591us-gaap_NetIncomeLoss	$ 30,246,388us-gaap_NetIncomeLoss	$ 26,067,897us-gaap_NetIncomeLoss	$ 25,394,824us-gaap_NetIncomeLoss	$ 19,637,038us-gaap_NetIncomeLoss	$ 72,580,551us-gaap_NetIncomeLoss	$ 117,507,438us-gaap_NetIncomeLoss	$ 101,247,298us-gaap_NetIncomeLoss
Net Income (loss) per share-basic	$ 0.76us-gaap_EarningsPerShareBasic	$ 0.76us-gaap_EarningsPerShareBasic	$ (0.58)us-gaap_EarningsPerShareBasic	$ 0.69us-gaap_EarningsPerShareBasic	$ 0.93us-gaap_EarningsPerShareBasic	$ 0.66us-gaap_EarningsPerShareBasic	$ 0.67us-gaap_EarningsPerShareBasic	$ 0.40us-gaap_EarningsPerShareBasic	$ 0.69us-gaap_EarningsPerShareBasic	$ 0.59us-gaap_EarningsPerShareBasic	$ 0.57us-gaap_EarningsPerShareBasic	$ 0.45us-gaap_EarningsPerShareBasic	$ 1.63us-gaap_EarningsPerShareBasic	$ 2.66us-gaap_EarningsPerShareBasic	$ 2.30us-gaap_EarningsPerShareBasic
Net Income (loss) per share-diluted	$ 0.76us-gaap_EarningsPerShareDiluted	$ 0.76us-gaap_EarningsPerShareDiluted	$ (0.58)us-gaap_EarningsPerShareDiluted	$ 0.69us-gaap_EarningsPerShareDiluted	$ 0.93us-gaap_EarningsPerShareDiluted	$ 0.66us-gaap_EarningsPerShareDiluted	$ 0.67us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted	$ 0.69us-gaap_EarningsPerShareDiluted	$ 0.59us-gaap_EarningsPerShareDiluted	$ 0.57us-gaap_EarningsPerShareDiluted	$ 0.45us-gaap_EarningsPerShareDiluted	$ 1.63us-gaap_EarningsPerShareDiluted	$ 2.66us-gaap_EarningsPerShareDiluted	$ 2.30us-gaap_EarningsPerShareDiluted
Weighted average shares
Basic	44,154,412us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	44,153,892us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	44,153,892us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	44,153,818us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	44,153,185us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	44,152,933us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	44,152,933us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	44,151,323us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	44,150,920us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	44,150,387us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	44,147,999us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	44,142,076us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	44,153,884us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	44,152,600us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	44,147,861us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted	44,154,412us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,153,892us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,182,668us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,153,818us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,153,185us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,152,933us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,152,933us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,151,357us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,152,895us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,157,321us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,152,133us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,147,796us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,153,884us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,152,600us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	44,149,838us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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