Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Tax Disclosure [Abstract]
Income tax expense	$ (3,685)	$ (1,778)	$ (7,979)	$ (2,742)
Income tax effective rate	141.50%	30.40%	126.30%	298.70%
Income tax effective rate excluding the impact of discrete charges	131.60%	29.60%	119.60%	256.60%