Supplemental Consolidated Balance Sheet and Statement of Operations Information (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016		Mar. 31, 2015	Dec. 31, 2015
Interest and Other Income [Abstract]
Interest income		$ 395		$ 227
Interest expense		(849)		(670)
Fair Value, Option, Changes in Fair Value, Gain (Loss)		(1,100)		0
Foreign exchange losses, net		6,456	[1]	(19,497)
Other Noncash Income (Expense)		(1,416)		13
Other expense, net		3,486		(19,927)
Reclassification of amount included in net income (loss) from continuing operations		1,500
Prepaid Expense and Other Assets, Current [Abstract]
Finished goods inventories		39,029			$ 42,305
Prepaid expenses		41,098			49,134
Income taxes receivable		22,249			32,483
VAT receivable		14,100			14,305
Other		18,355			15,478
Total prepaid expenses and other current assets		134,831			153,705
Merchant and Supplier Payables [Abstract]
Accrued merchant payables		458,399			471,607
Accrued supplier payables	[2]	215,754			304,604
Total accrued merchant and supplier payables		674,153			776,211
Accrued Expenses [Abstract]
Refunds reserve		33,383			35,297
Payroll and benefits		51,555			50,454
Customer credits		34,862			32,293
Restructuring Reserve, Current		10,158			11,556
Taxes Payable, Current		13,453			13,885
Deferred revenue		50,410			40,396
Capital lease obligations		26,679			26,776
Other		186,078			192,067
Total accrued expenses		406,578			402,724
Liabilities, Noncurrent [Abstract]
Long-term tax liabilities		53,283			46,506
Capital lease obligations		25,502			30,943
Other		44,586			36,091
Total other non-current liabilities		123,371			$ 113,540
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustments, beginning of period		52,261
Unrealized loss on available-for-sale securities, net of tax, beginning of period		458
Accumulated other comprehensive income (loss), pension and other postretirement benefit plans, net of tax, beginning of period		(1,513)
Accumulated other comprehensive income, beginning of period		51,206
Other Comprehensive income, pension adjustments		27		26
Foreign currency translation adjustments, end of period		49,498
Unrealized loss on available-for-sale securities, net of tax, end of period		342
Accumulated other comprehensive income (loss), pension and other postretirement benefit plans, net of tax, end of period		(1,486)
Accumulated other comprehensive income, end of period		48,354
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax		(1,500)
Accumulated Translation Adjustment [Member]
Interest and Other Income [Abstract]
Reclassification of amount included in net income (loss) from continuing operations		1,462
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax		(4,225)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive income, unrealized gain (loss) on available-for-sale securities		(2,763)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax		(1,462)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax		(116)
Pension and Other Postretirement Plans Costs [Member]
Interest and Other Income [Abstract]
Reclassification of amount included in net income (loss) from continuing operations		0
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax		27
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax		0
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive income, unrealized gain (loss) on available-for-sale securities		(116)		$ 137
Parent [Member]
Interest and Other Income [Abstract]
Reclassification of amount included in net income (loss) from continuing operations		1,462
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax		(116)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		(4,314)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive income		(2,852)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax		$ (1,462)

[1] Foreign currency gains (losses), net for the three months ended March 31, 2016 includes a $1.5 million cumulative translation loss that was reclassified to earnings as a result of the Company's exit from certain countries as part of its restructuring plan. Refer to Note 9, "Restructuring," for additional information.

[2] Amounts include payables to suppliers of inventories and providers of shipping and fulfillment services.