Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 1,562,627	$ 1,583,886	$ 1,570,008	$ 1,393,778	$ 1,578,929	$ 1,569,757	$ 1,517,375	$ 1,312,800	$ 6,110,299		$ 5,978,861		$ 5,659,141
Gross margin	299,416	302,958	293,345	259,026	292,613	294,535	281,942	249,457	1,154,745		1,118,547		1,044,156
Net income attributable to the Company	$ 25,209	$ 28,311	$ 25,088	$ 12,460	$ 16,599	$ 30,464	$ 29,044	$ 11,321	$ 91,068		$ 87,428		$ 81,063
Net income attributable to the Company per share of common stock (usd per share)	$ 1.55	$ 1.73	$ 1.53	$ 0.76	$ 1.02	$ 1.88	$ 1.79	$ 0.69	$ 5.57	[1]	$ 5.38	[1]	$ 4.96	[1]
Common stock dividend declared, percent									2.50%		0.00%		2.50%
Average common shares outstanding by quarter	15,927,663	15,942,178	15,986,695	16,023,053	15,802,792	15,798,638	15,841,788	15,969,254	16,364,441		16,243,882		16,334,145

[1] (A)Adjusted for the declaration of a 2.5% stock dividend in December 2015, shares related to which were issued in February 2016. Prior to the adjustment, the average common shares outstanding were 15,848 and 15,936 for the years ended December 31, 2014 and 2013, respectively.