Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Basis Of Presentation [Line Items]
Out-of-period adjustment to reduce accounts receivable	$ 2,965	$ (10,808)
Out-of-period adjustment
Basis Of Presentation [Line Items]
Out-of-period adjustment to reduce accounts receivable	$ 1,600