Foreign Currency Translation - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Foreign Currency [Abstract]
Foreign currency translation loss (gain)	$ (1,484)	$ (9,488)	$ 1,745
Foreign currency translation loss	$ 7,545	$ 36,004	$ 40,672