SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF GNC HOLDINGS, INC. (Details 2) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statements of Income and Comprehensive Income
Other selling, general and administrative									$ 131,270	$ 123,484	$ 113,477
Operating income	86,334	125,974	123,671	124,520	87,533	111,177	117,060	112,069	460,498	427,840	282,507
Interest expense, net									53,029	47,556	74,903
Income before income taxes									407,469	380,284	207,604
Income tax expense									142,448	140,088	75,271
Net income	47,657	73,033	71,688	72,643	47,438	62,229	66,671	63,857	265,021	240,196	132,333
Comprehensive income									263,929	240,519	136,337
Earnings per share:
Basic (in dollars per share)	$ 0.50	$ 0.77	$ 0.74	$ 0.73	$ 0.48	$ 0.61	$ 0.63	$ 0.60	$ 2.75	$ 2.32	$ 1.27
Diluted (in dollars per share)	$ 0.50	$ 0.76	$ 0.73	$ 0.73	$ 0.47	$ 0.60	$ 0.62	$ 0.59	$ 2.72	$ 2.29	$ 1.24
Dividends declared per share									$ 0.60	$ 0.44
Parent Company
Statements of Income and Comprehensive Income
Other selling, general and administrative									749	2,076	14,037
Subsidiary income									(265,522)	(241,492)	(140,359)
Operating income									264,773	239,416	126,322
Interest expense, net									44	(12)	(254)
Income before income taxes									264,729	239,428	126,576
Income tax expense									(292)	(768)	(5,757)
Net income									265,021	240,196	132,333
Comprehensive income									$ 263,929	$ 240,519	$ 136,337
Earnings per share:
Basic (in dollars per share)									$ 2.75	$ 2.32	$ 1.27
Diluted (in dollars per share)									$ 2.72	$ 2.29	$ 1.24
Dividends declared per share									$ 0.60	$ 0.44