Restructuring and Related Reorganization Activity (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Restructuring Cost and Reserve [Line Items]
Accrued liability Beginning Balance				$ 47,012
Charges	[1]	$ 9,833	$ 5,646	39,636	$ 10,322
Payments				(47,468)
Non-cash items				(11,847)
Accrued liability Ending Balance		27,333		27,333
Employee Severance and Benefits
Restructuring Cost and Reserve [Line Items]
Accrued liability Beginning Balance				45,889
Charges				25,114
Payments				(44,229)
Non-cash items				(204)
Accrued liability Ending Balance		26,570		26,570
Stock Based Compensation
Restructuring Cost and Reserve [Line Items]
Charges				11,643
Non-cash items				(11,643)
Other
Restructuring Cost and Reserve [Line Items]
Accrued liability Beginning Balance				1,123
Charges				2,879
Payments				(3,239)
Accrued liability Ending Balance		$ 763		$ 763

[1] Includes stock-based compensation as follows: Cost of revenue $ 2,884 $ 1,316 $ 5,292 $ 2,474 Selling and marketing 25,454 6,860 32,496 13,332 Technology and content 28,820 5,559 39,441 12,343 General and administrative 42,803 27,759 60,467 42,231 Restructuring and related reorganization charges 470 - 11,643 -