Quarterly Financial Data-Unaudited - Schedule of Quarterly Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 1,333,082	$ 1,419,947	$ 1,320,037	$ 1,254,139	$ 1,223,638	$ 1,336,676	$ 1,274,494	$ 1,250,485	$ 5,327,205	$ 5,085,293	$ 5,080,106
Gross profit	212,930	211,028	199,460	187,083	195,456	203,661	201,936	188,525	810,501	789,578	774,604
Net income	$ 25,841	$ 38,169	$ 33,331	$ 21,857	$ 34,125	$ 40,501	$ 34,670	$ 13,874	$ 119,198	$ 123,170	$ 111,830
Net income per share - basic	$ 0.67	$ 0.99	$ 0.86	$ 0.56	$ 0.86	$ 1.03	$ 0.87	$ 0.35	$ 3.08	$ 3.11	$ 2.77
Net income per share - diluted	$ 0.67	$ 0.98	$ 0.85	$ 0.55	$ 0.85	$ 1.01	$ 0.86	$ 0.34	$ 3.05	$ 3.06	$ 2.73