Restructuring and Related Reorganization Charges - Additional Information (Detail) - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2016	Jun. 30, 2016	Jun. 30, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring and related reorganization charges	[1]	$ 9,833,000	$ 5,646,000		$ 39,636,000	$ 10,322,000
Maximum | Scenario, Forecast
Restructuring Cost and Reserve [Line Items]
Restructuring and related reorganization charges				$ 55,000,000
Expected additional restructuring charges				$ 15,000,000

[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 -