Discontinued Operations - Balance Sheet Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Jan. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash	$ 0	$ 59,143		$ 120,861	$ 57,762
Total current assets of discontinued operations	0			179,689
Long-term assets of discontinued operations	0			538,931
Total current liabilities of discontinued operations	13,820			172,670
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent	0			7,708
Reduction to retained earnings	(3,553,680)			(4,010,737)
Transfer of Cash	28,523	$ 0
Accumulated other comprehensive loss associated with foreign currency translation adjustments reclassified to retained earnings	13,400
GoTo Business Division [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash	0			120,861
Accounts receivable, net	0			44,734
Prepaid expenses and other current assets	0			14,094
Total current assets of discontinued operations	0			179,689
Property and equipment, net	0			81,866
Goodwill	0			380,917
Other intangible assets, net	0			54,312
Deferred tax assets, net	0			18,496
Other assets	0			3,340
Long-term assets of discontinued operations	0			538,931
Total major classes of assets of discontinued operations	0			718,620
Accounts payable	13,820			11,333
Accrued expenses and other current liabilities	0			46,088
Current portion of deferred revenues	0			115,249
Total current liabilities of discontinued operations	13,820			172,670
Long-term portion of deferred revenues	0			4,224
Other liabilities	0			3,484
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent	0			7,708
Total major classes of liabilities of discontinued operations	13,820			$ 180,378
Reduction to retained earnings			$ 479,400
Reduction to net assets			$ 466,000
Accumulated Foreign Currency Adjustment [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accumulated other comprehensive loss associated with foreign currency translation adjustments reclassified to retained earnings	13,400
Accumulated Foreign Currency Adjustment [Member] | GoTo Business Division [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accumulated other comprehensive loss associated with foreign currency translation adjustments reclassified to retained earnings	$ 13,400