Effects of Restatement on Consolidated Statements of Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net sales	$ 200,950	$ 184,280	$ 392,850	$ 338,039
Cost of sales	156,782	150,307	308,768	271,749
Operating income	20,545	10,191	34,550	20,610
Income before income taxes	602	6,585	10,401	12,540
Provision for income taxes	(878)	2,519	2,104	4,541
Net income attributable to continuing operations	1,480	4,066	8,297	7,999
Net income	1,173	4,519	8,141	9,023
Basic earnings per share - continuing operations	$ 0.05	$ 0.13	$ 0.27	$ 0.26
Diluted earnings per share - continuing operations	$ 0.05	$ 0.13	$ 0.27	$ 0.26
Previously Reported
Net sales		190,277		353,127
Cost of sales		153,781		280,926
Operating income		11,934		24,952
Income before income taxes		8,328		16,882
Provision for income taxes		3,165		6,094
Net income attributable to continuing operations		5,163		10,788
Net income		5,163		10,788
Basic earnings per share - continuing operations		$ 0.17		$ 0.36
Diluted earnings per share - continuing operations		$ 0.17		$ 0.36
Restatement Adjustment
Net sales		1,971		1,161
Cost of sales		2,997		3,894
Operating income		(1,026)		(2,733)
Income before income taxes		(1,026)		(2,733)
Provision for income taxes		(382)		(968)
Net income attributable to continuing operations		(644)		(1,765)
Net income		(644)		(1,765)
Basic earnings per share - continuing operations		$ (0.02)		$ (0.06)
Diluted earnings per share - continuing operations		$ (0.02)		$ (0.06)
As Corrected
Net sales		192,248		354,288
Cost of sales		156,778		284,820
Operating income		10,908		22,219
Income before income taxes		7,302		14,149
Provision for income taxes		2,783		5,126
Net income attributable to continuing operations		4,519		9,023
Net income		4,519		9,023
Basic earnings per share - continuing operations		$ 0.15		$ 0.30
Diluted earnings per share - continuing operations		$ 0.15		$ 0.30
Discontinued Operations
Net sales		(7,968)		(16,249)
Cost of sales		(6,471)		(13,071)
Operating income		(717)		(1,609)
Income before income taxes		(717)		(1,609)
Provision for income taxes		(264)		(585)
Net income attributable to continuing operations		$ (453)		$ (1,024)
Basic earnings per share - continuing operations		$ (0.01)		$ (0.03)
Diluted earnings per share - continuing operations		$ (0.01)		$ (0.03)