ACCOUNTING POLICIES (Details 4) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 segment	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Revenue recognition
Number of principal segments			2
Product delivery period from date of shipment, minimum			1 day
Product delivery period from date of shipment, maximum			8 days
International
Maximum revenue from International customers as a percentage of total net revenues	1.00%	1.00%	1.00%	1.00%
Consignment
Maximum revenue from consignment as a percentage of total net revenues	1.00%	1.00%	1.00%	1.00%
Ecommerce marketplace channels
Revenue from ecommerce marketplace channels as a percentage of total net revenues	2.10%		2.50%
Revenue from ecommerce marketplace channels as a maximum percentage of total net revenues		1.00%		1.00%
Other businesses
Maximum revenue from other businesses as a percentage of total net revenues	1.00%	1.00%	1.00%	1.00%
Club O loyalty program
Expiration period of Club O reward dollars after expiration of the customer's membership			90 days
Co-branded credit card program
Maximum revenue from co-branded credit card program as a percentage of total net revenues	1.00%	1.00%	1.00%	1.00%
Deferred revenue
Likelihood of gift card redemption to be remote, period			36 months
Sales returns allowance
Sales return period for which full refund will be granted			30 days
Sales return period for which reduced refund will be granted			30 days
Sales return received at returns processing facility for which reduced refund will be granted, period			45 days
Allowance for sales returns	$ 7,300,000		$ 7,300,000		$ 7,300,000		$ 10,600,000
Credit card chargeback allowance
Credit card chargeback allowance	48,000		48,000		48,000		182,000
Cost of goods sold
Total revenue, net	301,426,000	255,352,000	906,624,000	757,255,000
Total revenue, net (as a percent)	100.00%	100.00%	100.00%	100.00%
Cost of goods sold
Product costs and other cost of goods sold	228,963,000	196,522,000	690,563,000	582,436,000
Fulfillment and related costs	13,313,000	12,288,000	40,136,000	37,600,000
Total cost of goods sold	242,276,000	208,810,000	730,699,000	620,036,000
Product costs and other cost of goods sold (as a percent)	76.00%	77.00%	76.00%	77.00%
Fulfillment and related costs (as a percent)	4.00%	5.00%	4.00%	5.00%
Total cost of goods sold (as a percent)	80.00%	82.00%	81.00%	82.00%
Gross profit	59,150,000	46,542,000	175,925,000	137,219,000
Gross profit (as a percent)	20.00%	18.00%	19.00%	18.00%
Advertising expense
Advertising expense	20,200,000	12,800,000	53,500,000	37,000,000
Prepaid advertising expense	2,100,000		2,100,000		2,100,000		1,200,000
Gain (Loss) on Investment in Precious Metals	$ (93,000)	$ 0	$ (475,000)	$ 0	$ (475,000)	$ 0
Minimum
International business
Number of countries where entity offers its products to customers	100		100		100