Condensed Consolidating Statement of Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Revenues	$ 495,887	$ 540,238	$ 978,409	$ 1,058,823
Costs and expenses:
Cost of sales	364,543	403,727	725,311	792,621
Selling, general and administrative	77,723	83,523	154,055	161,140
Amortization expense	3,729	3,156	7,458	6,312
Goodwill, Impairment Loss	0	7,585	0	7,585
Total costs and expenses	445,995	497,991	886,824	967,658
Earnings (loss) from operations	49,892	42,247	91,585	91,165
Other expenses and income:
Interest expense	7,498	6,755	15,177	13,809
Interest income	(46)	(70)	(108)	(128)
Intercompany interest	0	0	0	0
Other income, net	(621)	(77)	(923)	(774)
Total other expenses (income), net	(6,831)	(6,608)	(14,146)	(12,907)
Earnings (loss) before income taxes	43,061	35,639	77,439	78,258
Income tax (benefit) expense	16,275	13,932	28,984	30,130
Equity in net earnings (loss) of subsidiaries	0	0	0	0
Net earnings	26,786	21,707	48,455	48,128
Other Comprehensive Income (Loss), Net of Tax	(191)	(372)	(685)	(426)
Comprehensive income	26,595	21,335	47,770	47,702
Parent Company
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Revenues	135,044	171,537	272,114	342,828
Costs and expenses:
Cost of sales	103,890	145,141	212,333	290,283
Selling, general and administrative	28,271	33,439	49,896	53,809
Amortization expense	5	5	11	11
Goodwill, Impairment Loss		3,985		3,985
Total costs and expenses	132,166	182,570	262,240	348,088
Earnings (loss) from operations	2,878	(11,033)	9,874	(5,260)
Other expenses and income:
Interest expense	7,498	6,755	15,177	13,809
Interest income	(34)	(38)	(52)	(60)
Intercompany interest	(2,183)	(1,788)	(11,233)	(10,755)
Other income, net	(65)	129	(58)	(15)
Total other expenses (income), net	(5,216)	(5,058)	(3,834)	(2,979)
Earnings (loss) before income taxes	(2,338)	(16,091)	6,040	(8,239)
Income tax (benefit) expense	595	(5,005)	1,536	(2,587)
Equity in net earnings (loss) of subsidiaries	29,719	32,793	43,951	53,780
Net earnings	26,786	21,707	48,455	48,128
Other Comprehensive Income (Loss), Net of Tax	(191)	(372)	(685)	(426)
Comprehensive income	26,595	21,335	47,770	47,702
Guarantor Subsidiaries
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Revenues	448,591	457,664	889,032	887,678
Costs and expenses:
Cost of sales	301,696	294,725	600,709	577,820
Selling, general and administrative	97,779	100,689	201,604	203,483
Amortization expense	3,724	3,151	7,447	6,301
Goodwill, Impairment Loss		3,600		3,600
Total costs and expenses	403,199	402,165	809,760	791,204
Earnings (loss) from operations	45,392	55,499	79,272	96,474
Other expenses and income:
Interest expense	0	0	0	0
Interest income	0	0	0	0
Intercompany interest	2,183	1,741	11,233	10,708
Other income, net	(1,336)	(107)	(624)	(723)
Total other expenses (income), net	(847)	(1,634)	(10,609)	(9,985)
Earnings (loss) before income taxes	44,545	53,865	68,663	86,489
Income tax (benefit) expense	15,553	18,548	27,025	31,908
Equity in net earnings (loss) of subsidiaries	727	(2,524)	2,313	(801)
Net earnings	29,719	32,793	43,951	53,780
Other Comprehensive Income (Loss), Net of Tax	(514)	203	(1,636)	553
Comprehensive income	29,205	32,996	42,315	54,333
Non-Guarantor Subsidiaries
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Revenues	17,477	14,504	32,299	31,886
Costs and expenses:
Cost of sales	12,436	13,616	23,172	25,544
Selling, general and administrative	3,419	3,107	6,688	6,391
Amortization expense	0	0	0	0
Goodwill, Impairment Loss		0		0
Total costs and expenses	15,855	16,723	29,860	31,935
Earnings (loss) from operations	1,622	(2,219)	2,439	(49)
Other expenses and income:
Interest expense	0	0	0	0
Interest income	(12)	(32)	(56)	(68)
Intercompany interest	0	47	0	47
Other income, net	780	(99)	(241)	(36)
Total other expenses (income), net	(768)	84	297	57
Earnings (loss) before income taxes	854	(2,135)	2,736	8
Income tax (benefit) expense	127	389	423	809
Equity in net earnings (loss) of subsidiaries	0	0	0	0
Net earnings	727	(2,524)	2,313	(801)
Other Comprehensive Income (Loss), Net of Tax	(514)	203	(1,636)	553
Comprehensive income	213	(2,321)	677	(248)
Consolidating Adjustments
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Revenues	(105,225)	(103,467)	(215,036)	(203,569)
Costs and expenses:
Cost of sales	(53,479)	(49,755)	(110,903)	(101,026)
Selling, general and administrative	(51,746)	(53,712)	(104,133)	(102,543)
Amortization expense	0	0	0	0
Goodwill, Impairment Loss		0		0
Total costs and expenses	(105,225)	(103,467)	(215,036)	(203,569)
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	0
Equity in net earnings (loss) of subsidiaries	(30,446)	(30,269)	(46,264)	(52,979)
Net earnings	(30,446)	(30,269)	(46,264)	(52,979)
Other Comprehensive Income (Loss), Net of Tax	1,028	(406)	3,272	(1,106)
Comprehensive income	$ (29,418)	$ (30,675)	$ (42,992)	$ (54,085)