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Computation of Basic and Diluted Net Income per Share Attributable to Ordinary Shareholders (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Computation of Earnings Per Share [Line Items]
Net income attributable to ordinary shareholders-basic and diluted	$ 72,406,504us-gaap_NetIncomeLoss	$ 51,435,171us-gaap_NetIncomeLoss	$ 22,826,454us-gaap_NetIncomeLoss
Weighted average number of ordinary shares outstanding-basic	27,873,501us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	27,480,150us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	27,751,335us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted average number of ordinary shares outstanding-diluted	28,227,823us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	28,008,386us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	28,073,731us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic net income per share	$ 2.60us-gaap_EarningsPerShareBasic	$ 1.87us-gaap_EarningsPerShareBasic	$ 0.82us-gaap_EarningsPerShareBasic
Diluted net income per share	$ 2.57us-gaap_EarningsPerShareDiluted	$ 1.84us-gaap_EarningsPerShareDiluted	$ 0.81us-gaap_EarningsPerShareDiluted
Stock Options
Computation of Earnings Per Share [Line Items]
Additional shares included in the calculation of diluted EPS	178,203us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	229,339us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	249,756us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Restricted Stock
Computation of Earnings Per Share [Line Items]
Additional shares included in the calculation of diluted EPS	176,119us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	298,897us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	72,640us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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