Subsequent Event - Additional Information (Detail) - USD ($) $ in Thousands		2 Months Ended	12 Months Ended
	Oct. 29, 2015	Feb. 28, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Subsequent Event [Line Items]
Repurchased common stock, value			$ 24,116	$ 6,531	$ 1,613
Three-Year Share Repurchase Program [Member]
Subsequent Event [Line Items]
Repurchased common stock, shares			1,190
Repurchased common stock, value			$ 24,116
Three-Year Share Repurchase Program [Member] | Subsequent Events [Member]
Subsequent Event [Line Items]
Repurchased common stock, shares		3,400,000
Repurchased common stock, value		$ 35,600
GreenHaven Commodity Services, LLC [Member]
Subsequent Event [Line Items]
Cash consideration to acquire business	$ 11,839