Condensed Consolidating Statement of Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Revenues	$ 489,383	$ 523,822	$ 1,467,792	$ 1,582,645
Costs and expenses:
Cost of sales	361,337	388,284	1,086,648	1,180,905
Selling, general and administrative	74,577	73,358	228,632	234,498
Amortization expense	3,729	3,245	11,187	9,557
Goodwill, Impairment Loss	0	0	0	7,585
Total costs and expenses	439,643	464,887	1,326,467	1,432,545
Earnings (loss) from operations	49,740	58,935	141,325	150,100
Other expenses and income:
Interest expense	7,287	7,563	22,464	21,372
Interest income	(30)	(46)	(138)	(174)
Intercompany interest	0	0	0	0
Other income, net	(1,713)	249	(2,636)	(525)
Total other expenses (income), net	(5,544)	(7,766)	(19,690)	(20,673)
Earnings (loss) before income taxes	44,196	51,169	121,635	129,427
Income tax (benefit) expense	16,483	14,429	45,467	44,559
Equity in net earnings (loss) of subsidiaries	0	0	0	0
Net earnings	27,713	36,740	76,168	84,868
Other Comprehensive Income (Loss), Net of Tax	907	(9)	222	(435)
Comprehensive income	28,620	36,731	76,390	84,433
Parent Company
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Revenues	126,994	172,888	399,108	515,716
Costs and expenses:
Cost of sales	100,190	145,467	312,523	435,750
Selling, general and administrative	23,682	23,033	73,578	76,842
Amortization expense	6	6	17	17
Goodwill, Impairment Loss				3,985
Total costs and expenses	123,878	168,506	386,118	516,594
Earnings (loss) from operations	3,116	4,382	12,990	(878)
Other expenses and income:
Interest expense	7,287	7,563	22,464	21,372
Interest income	(18)	(20)	(70)	(80)
Intercompany interest	(9,082)	(9,062)	(20,315)	(19,817)
Other income, net	(816)	49	(874)	34
Total other expenses (income), net	2,629	1,470	(1,205)	(1,509)
Earnings (loss) before income taxes	5,745	5,852	11,785	(2,387)
Income tax (benefit) expense	684	(3,429)	2,220	(6,016)
Equity in net earnings (loss) of subsidiaries	22,652	27,459	66,603	81,239
Net earnings	27,713	36,740	76,168	84,868
Other Comprehensive Income (Loss), Net of Tax	907	(9)	222	(435)
Comprehensive income	28,620	36,731	76,390	84,433
Guarantor Subsidiaries
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Revenues	453,902	445,063	1,342,934	1,332,741
Costs and expenses:
Cost of sales	308,615	286,533	909,324	864,353
Selling, general and administrative	95,278	101,614	296,882	305,097
Amortization expense	3,723	3,239	11,170	9,540
Goodwill, Impairment Loss				3,600
Total costs and expenses	407,616	391,386	1,217,376	1,182,590
Earnings (loss) from operations	46,286	53,677	125,558	150,151
Other expenses and income:
Interest expense	0	0	0	0
Interest income	0	3	0	3
Intercompany interest	9,082	9,062	20,315	19,770
Other income, net	(835)	197	(1,459)	(526)
Total other expenses (income), net	(8,247)	(9,262)	(18,856)	(19,247)
Earnings (loss) before income taxes	38,039	44,415	106,702	130,904
Income tax (benefit) expense	15,557	17,632	42,582	49,540
Equity in net earnings (loss) of subsidiaries	170	4,276	2,483	3,475
Net earnings	22,652	31,059	66,603	84,839
Other Comprehensive Income (Loss), Net of Tax	(707)	197	929	750
Comprehensive income	21,945	31,256	67,532	85,589
Non-Guarantor Subsidiaries
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Revenues	13,813	12,868	46,112	44,754
Costs and expenses:
Cost of sales	9,893	9,093	33,065	34,637
Selling, general and administrative	3,582	2,899	10,270	9,290
Amortization expense	0	0	0	0
Goodwill, Impairment Loss				0
Total costs and expenses	13,475	11,992	43,335	43,927
Earnings (loss) from operations	338	876	2,777	827
Other expenses and income:
Interest expense	0	0	0	0
Interest income	(12)	(29)	(68)	(97)
Intercompany interest	0	0	0	47
Other income, net	(62)	3	(303)	(33)
Total other expenses (income), net	74	26	371	83
Earnings (loss) before income taxes	412	902	3,148	910
Income tax (benefit) expense	242	226	665	1,035
Equity in net earnings (loss) of subsidiaries	0	0		0
Net earnings	170	676	2,483	(125)
Other Comprehensive Income (Loss), Net of Tax	(707)	197	929	750
Comprehensive income	(537)	873	3,412	625
Consolidating Adjustments
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Revenues	(105,326)	(106,997)	(320,362)	(310,566)
Costs and expenses:
Cost of sales	(57,361)	(52,809)	(168,264)	(153,835)
Selling, general and administrative	(47,965)	(54,188)	(152,098)	(156,731)
Amortization expense	0	0	0	0
Goodwill, Impairment Loss				0
Total costs and expenses	(105,326)	(106,997)	(320,362)	(310,566)
Earnings (loss) from operations	0	0	0	0
Other expenses and income:
Interest expense	0	0	0	0
Interest income	0	0	0	0
Intercompany interest	0	0	0	0
Other income, net	0	0	0	0
Total other expenses (income), net	0	0	0	0
Earnings (loss) before income taxes	0	0	0	0
Income tax (benefit) expense	0	0		0
Equity in net earnings (loss) of subsidiaries	(22,822)	(31,735)	(69,086)	(84,714)
Net earnings	(22,822)	(31,735)	(69,086)	(84,714)
Other Comprehensive Income (Loss), Net of Tax	1,414	(394)	(1,858)	(1,500)
Comprehensive income	$ (21,408)	$ (32,129)	$ (70,944)	$ (86,214)