Other Income (Loss), Net - Schedule of Other Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Other Income and Expenses [Abstract]
Gain (loss) on sales/distributions of ownership interests	$ 958	$ 46
Other	(91)	(136)
Total other income (loss), net	$ 867	$ (90)