Quarterly Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2016		Sep. 30, 2016		Jun. 30, 2016		Mar. 31, 2016		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Net sales	$ 995,703		$ 1,266,930		$ 1,021,814		$ 805,407		$ 805,891		$ 1,139,643		$ 874,642		$ 792,738		$ 4,089,854		$ 3,612,914		$ 3,763,971
Gross profit	158,802		212,559		165,189		124,566		110,013		181,939		127,707		113,877		661,116		533,536		554,126
Net income	$ 146,119	[1]	$ 72,382	[1]	$ 27,926	[1]	$ 23,232	[1]	$ 23,694	[2]	$ 69,770	[2]	$ 33,315	[2]	$ 26,572	[2]	$ 269,659		$ 153,351		$ 172,413
Basic net income per share (in dollars per share)	$ 1.32	[1],[3]	$ 0.66	[1],[3]	$ 0.25	[1],[3]	$ 0.21	[1],[3]	$ 0.20	[2],[3]	$ 0.58	[2],[3]	$ 0.28	[2],[3]	$ 0.22	[2],[3]	$ 2.44	[4]	$ 1.28	[4]	$ 1.41	[4]
Diluted net income per share (in dollars per share)	1.31	[1],[3]	0.65	[1],[3]	0.25	[1],[3]	0.21	[1],[3]	0.20	[2],[3]	0.57	[2],[3]	0.27	[2],[3]	0.22	[2],[3]	2.42	[4]	1.27	[4]	1.41	[4]
Dividends per share (in dollars per share)	$ 0.09		$ 0.09		$ 0.09		$ 0.09		$ 0.085		$ 0.085		$ 0.085		$ 0.085		$ 0.36	[4]	$ 0.34	[4]	$ 0.32	[4]
Rationalization charges	$ 1,300	[1]	$ 600	[1]	$ 3,000	[1]	$ 900	[1]	$ 5,100	[2]	$ 7,800	[2]	$ 5,000	[2]	$ 1,100	[2]	$ 5,826		$ 19,061		$ 14,407
Operating Income (Loss)																	356,990		299,730		319,812
Loss on early extinguishment of debt					4,400		2,700										7,052		0		0
Income tax benefit from impact of 2017 Tax Act	110,900
Business Combination, Acquisition Related Costs	$ 900		$ 800		$ 9,800		$ 13,200		$ 1,400
Corporate Segment [Member]
Net sales																	0		0		0
Rationalization charges																			0		0
Operating Income (Loss)																	(43,027)	[5]	(20,003)	[5]	$ (16,200)
Business Combination, Acquisition Related Costs																	$ 24,700		$ 1,400

[1] The first, second, third and fourth quarters of 2017 include rationalization charges of $0.9 million, $3.0 million, $0.6 million and $1.3 million, respectively. The first, second, third and fourth quarters of 2017 includes costs attributed to announced acquisitions of $13.2 million, $9.8 million, $0.8 million and $0.9 million, respectively. The first and second quarters of 2017 include a loss on early extinguishment of debt of $2.7 million and $4.4 million, respectively. The fourth quarter of 2017 includes the benefit from effective tax rate adjustments totaling $110.9 million primarily related to the remeasurement of net deferred tax liabilities to reflect the lower future cash tax obligations as a result of the reduction in the federal corporate tax rate under the 2017 Tax Act.

[2] The first, second, third and fourth quarters of 2016 include rationalization charges of $1.1 million, $5.0 million, $7.8 million and $5.1 million, respectively. The fourth quarter of 2016 includes costs attributed to announced acquisitions of $1.4 million.

[3] Net income per share data is computed independently for each of the periods presented. Accordingly, the sum of the quarterly earnings per share amounts may not equal the total for the year.

[4] Per share amounts for 2016 and 2015 have been retroactively adjusted for the two-for-one stock split discussed in Note 1.

[5] Corporate includes costs attributed to announced acquisitions of $24.7 million and $1.4 million in 2017 and 2016, respectively.