Transition Period (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended									12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Mar. 31, 2015	Dec. 31, 2013	Dec. 31, 2012
Transition Period [Abstract]
Net sales	$ 340,637	$ 784,678	$ 480,273	$ 211,469	$ 294,716	$ 736,048	$ 386,725	$ 170,085	$ 263,760	$ 1,817,057	$ 1,556,618	$ 1,414,398
Cost of sales					150,456				140,201	938,949	820,135	782,244
Gross profit	152,324	415,139	223,873	86,772	144,260	376,200	166,892	69,832	123,559	878,108	736,483	632,154
Selling, general and administrative (SG&A) expenses					144,668				120,907	653,689	528,586	445,206
Income (loss) from operations					(408)				2,652	224,419	207,897	186,948
Other expense (income), net:
Interest income					(65)				(26)	(207)	(60)	(217)
Interest expense					516				339	4,220	3,079	3,840
Other, net					(117)				(171)	(733)	(679)	(793)
Total other expense, net					334				142	3,280	2,340	2,830
(Loss) income before income taxes					(742)				2,510	221,139	205,557	184,118
Income tax expense					1,943				1,503	59,359	59,868	55,104
Net income (loss)					(2,685)				1,007	161,780	145,689	129,014
Other comprehensive income (loss), net of tax:
Unrealized (loss) income on foreign currency hedging					(273)				1,530	450	(486)	(633)
Foreign currency translation adjustment					873				(674)	(18,875)	(757)	963
Total other comprehensive (loss) income					600				856	(18,425)	(1,243)	330
Comprehensive income (loss)					$ (2,085)				$ 1,863	$ 143,355	$ 144,446	$ 129,344
Net (loss) income per share:
Basic (in dollars per share)	$ 0.04	$ 4.54	$ 1.18	$ (1.07)	$ (0.08)	$ 4.08	$ 0.96	$ (0.85)	$ 0.03	$ 4.70	$ 4.23	$ 3.49
Diluted (in dollars per share)	$ 0.04	$ 4.50	$ 1.17	$ (1.07)	$ (0.08)	$ 4.04	$ 0.95	$ (0.85)	$ 0.03	$ 4.66	$ 4.18	$ 3.45
Weighted-average common shares outstanding:
Basic (in shares)					34,621				34,404	34,433	34,473	36,879
Diluted (in shares)					34,621				34,788	34,733	34,829	37,334