SEGMENT INFORMATION (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 item	Jun. 30, 2013
SEGMENT INFORMATION
Number of reportable segments			2
Number of operating segments			2
Segment information
Net sales	$ 687,199,000	$ 630,934,000	$ 1,223,329,000	$ 1,115,158,000
Contribution margin	257,467,000	216,148,000	444,231,000	355,502,000
Corporate and unallocated expenses	(41,654,000)	(36,721,000)	(79,554,000)	(68,770,000)
Operating income	215,813,000	179,427,000	364,677,000	286,732,000
Other income (expense)	178,000	(3,402,000)	332,000	(5,303,000)
Income before provision for income taxes	215,991,000	176,025,000	365,009,000	281,429,000
Depreciation and amortization	(6,544,000)	(5,277,000)	(12,995,000)	(10,337,000)
Stock-based compensation expense	8,100,000	7,400,000	15,100,000	14,400,000
Corporate and Unallocated
Segment information
Corporate and unallocated expenses	(41,654,000)	(36,721,000)	(79,554,000)	(68,770,000)
Other income (expense)	(94,000)	(3,501,000)	34,000	(5,591,000)
Depreciation and amortization	(1,444,000)	(615,000)	(2,870,000)	(1,195,000)
Payroll cost	21,600,000	21,400,000	42,600,000	40,800,000
Stock-based compensation expense	8,100,000	7,400,000	15,100,000	14,400,000
Professional service expenses	15,300,000	9,300,000	25,400,000	16,900,000
Other operating expenses	4,800,000	6,000,000	11,600,000	11,100,000
Direct Store Delivery ("DSD") | Operating segment
Segment information
Net sales	660,105,000	600,992,000	1,174,460,000	1,061,168,000
Contribution margin	256,147,000	215,018,000	442,615,000	353,991,000
Other income (expense)	272,000	99,000	298,000	288,000
Depreciation and amortization	(5,018,000)	(4,598,000)	(9,962,000)	(9,019,000)
Warehouse ("Warehouse") | Operating segment
Segment information
Net sales	27,095,000	29,942,000	48,869,000	53,990,000
Contribution margin	1,320,000	1,130,000	1,616,000	1,511,000
Depreciation and amortization	$ (82,000)	$ (64,000)	$ (163,000)	$ (123,000)