Other (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other Income and Expenses [Abstract]
Foreign currency transaction gains (losses)	$ 2,023	$ (4,806)	$ 1,689	$ (1,084)
Realized gain on sale of available-for-sale securities		24,465		24,465
Total	$ 2,023	$ 19,659	$ 1,689	$ 23,381