Other (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]
Foreign currency transaction gains	$ 2,794	$ 4,314	$ 4,483	$ 3,230
Realized gain on sale of available-for-sale securities				24,465
Total	$ 2,794	$ 4,314	$ 4,483	$ 27,695