Schedule Of Fair Value Assigned To Assets Acquired And Liabilities Assumed (Detail) (USD $)	Mar. 22, 2012 PSI Energy Solutions, LLC	Dec. 29, 2011 Angus	Dec. 02, 2011 Coleman Cylinders	Sep. 30, 2011 STAKO	Jul. 01, 2011 Bernz	Mar. 02, 2011 MISA Metals, Inc	Dec. 28, 2010 Worthington Nitin Cylinders Limited	Jun. 21, 2010 Hy-Mark Cylinders, Inc
Business Acquisition [Line Items]
Cash and cash equivalents		$ 2,540,000		$ 2,715,000			$ 1,721,000
Accounts receivable	784,000	16,515,000		4,175,000		24,470,000	2,499,000
Inventories	407,000	22,865,000	6,456,000	6,208,000	15,313,000	40,262,000	9,916,000	3,053,000
Prepaid expenses and other current assets		1,281,000		75,000		7,426,000	652,000
Deferred income taxes		398,000
Intangible assets	3,390,000	52,903,000	4,560,000	4,400,000	21,222,000	300,000	1,240,000	2,660,000
Other noncurrent assets		74,000		60,000
Property, plant and equipment	66,000	57,570,000	9,726,000	23,770,000	7,884,000	16,319,000	14,450,000	2,100,000
Total identifiable assets	4,647,000	154,146,000	20,742,000	41,403,000	44,419,000	88,777,000	30,478,000
Accounts payable	(528,000)	(9,581,000)	(3,719,000)	(2,813,000)	(6,167,000)	(15,062,000)	(1,227,000)
Accrued liabilities	(437,000)	(7,483,000)	(258,000)	(750,000)	(868,000)	(1,115,000)	(41,000)
Other current liabilities		(948,000)		(2,182,000)
Long-term debt and other short-term borrowings		(47,324,000)
Deferred income taxes				(2,384,000)			(992,000)
Net identifiable assets	3,682,000	88,810,000	16,765,000	33,274,000	37,384,000	72,600,000	28,218,000	7,813,000
Goodwill	5,651,000	45,230,000	5,888,000	8,226,000	3,616,000		7,174,000	4,362,000
Total consideration transferred		134,040,000
Net assets	9,333,000						35,392,000
Total purchase price						72,600,000
Noncontrolling interest	(2,333,000)						(14,156,000)
Total consideration paid	$ 7,000,000	$ 132,940,000	$ 22,653,000	$ 41,500,000	$ 41,000,000		$ 21,236,000	$ 12,175,000