Condensed Consolidating Statement of Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Revenues	$ 482,522	$ 518,585
Costs and expenses:
Cost of sales	360,768	388,894
Selling, general and administrative	76,332	77,617
Amortization expense	3,729	3,156
Total costs and expenses	440,829	469,667
Earnings (loss) from operations	41,693	48,918
Other expenses and income:
Interest expense	7,679	7,054
Interest income	(62)	(58)
Intercompany interest	0	0
Other income, net	(302)	(697)
Total other expenses (income), net	7,315	6,299
Earnings (loss) before income taxes	34,378	42,619
Income tax (benefit) expense	12,709	16,198
Equity in net earnings (loss) of subsidiaries	0	0
Net earnings	21,669	26,421
Other Comprehensive Income (Loss), Net of Tax	(494)	(54)
Comprehensive income	21,175	26,367
Parent Company
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Revenues	137,070	171,291
Costs and expenses:
Cost of sales	108,443	145,142
Selling, general and administrative	21,625	20,370
Amortization expense	6	6
Total costs and expenses	130,074	165,518
Earnings (loss) from operations	6,996	5,773
Other expenses and income:
Interest expense	7,679	7,054
Interest income	(18)	(22)
Intercompany interest	(9,050)	(8,967)
Other income, net	7	(144)
Total other expenses (income), net	(1,382)	(2,079)
Earnings (loss) before income taxes	8,378	7,852
Income tax (benefit) expense	941	2,418
Equity in net earnings (loss) of subsidiaries	14,232	20,987
Net earnings	21,669	26,421
Other Comprehensive Income (Loss), Net of Tax	(494)	(54)
Comprehensive income	21,175	26,367
Guarantor Subsidiaries
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Revenues	440,441	430,014
Costs and expenses:
Cost of sales	299,013	283,095
Selling, general and administrative	103,825	102,794
Amortization expense	3,723	3,150
Total costs and expenses	406,561	389,039
Earnings (loss) from operations	33,880	40,975
Other expenses and income:
Interest expense	0	0
Interest income	0	0
Intercompany interest	9,050	8,967
Other income, net	712	(616)
Total other expenses (income), net	9,762	8,351
Earnings (loss) before income taxes	24,118	32,624
Income tax (benefit) expense	11,472	13,360
Equity in net earnings (loss) of subsidiaries	1,586	1,723
Net earnings	14,232	20,987
Other Comprehensive Income (Loss), Net of Tax	(1,112)	350
Comprehensive income	13,120	21,337
Non-Guarantor Subsidiaries
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Revenues	14,822	17,382
Costs and expenses:
Cost of sales	10,736	11,928
Selling, general and administrative	3,269	3,284
Amortization expense	0	0
Total costs and expenses	14,005	15,212
Earnings (loss) from operations	817	2,170
Other expenses and income:
Interest expense	0	0
Interest income	(44)	(36)
Intercompany interest	0	0
Other income, net	(1,021)	63
Total other expenses (income), net	(1,065)	27
Earnings (loss) before income taxes	1,882	2,143
Income tax (benefit) expense	296	420
Equity in net earnings (loss) of subsidiaries	0	0
Net earnings	1,586	1,723
Other Comprehensive Income (Loss), Net of Tax	(1,112)	350
Comprehensive income	474	2,073
Consolidating Adjustments
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Revenues	(109,811)	(100,102)
Costs and expenses:
Cost of sales	(57,424)	(51,271)
Selling, general and administrative	(52,387)	(48,831)
Amortization expense	0	0
Total costs and expenses	(109,811)	(100,102)
Earnings (loss) from operations	0	0
Other expenses and income:
Interest expense	0	0
Interest income	0	0
Intercompany interest	0	0
Other income, net	0	0
Total other expenses (income), net	0	0
Earnings (loss) before income taxes	0	0
Income tax (benefit) expense	0	0
Equity in net earnings (loss) of subsidiaries	(15,818)	(22,710)
Net earnings	(15,818)	(22,710)
Other Comprehensive Income (Loss), Net of Tax	2,224	(700)
Comprehensive income	$ (13,594)	$ (23,410)