Redeemable Non-Controlling Interests (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	$ 0	$ 123,902
Net loss attributable to redeemable non-controlling interest	0	(1,179)	$ 1,438
Other comprehensive income attributable to redeemable non-controlling interests	$ 0	1,810	(7,526)
Increase in redemption value of non-controlling interests		90,913	47,940
Impact of foreign currency translation		1,724
Exercise of vested and outstanding ALOG stock options		8,459
Purchase price of redeemable non-controlling interests		(225,629)
Ending balance		$ 0	$ 123,902