Other Income, Net - Schedule of Other Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Other Income and Expenses [Abstract]
Gain (loss) on sales/distributions of ownership interests	$ 2,842	$ (1)	$ 2,888	$ 1,388
Foreign currency (loss) gain	(11)	97	(162)	149
Total other income, net	$ 2,831	$ 96	$ 2,726	$ 1,537