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Components of Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Condensed Statement of Income Captions [Line Items]
Net Income	$ 45,845	$ 44,069	$ 32,584	$ 18,711
Other comprehensive income (loss):
Foreign currency translation adjustment	(1,861)	(248)	(1,904)	241
Comprehensive income	$ 43,984	$ 43,821	$ 30,680	$ 18,952

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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