Schedule II - Valuation and Qualifying Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Allowance for Doubtful Receivables [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Beginning Balance	$ 480		$ 469		$ 622
Charges to Costs and Expenses	384		60		162
Charges (Deductions) to Other Accounts	(39)	[1]	15	[1]	7	[1]
Deductions	(116)	[2]	(64)	[2]	(322)	[2]
Valuation Allowances and Reserves, Ending balance	709		480		469
Allowance for Note Receivable [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Beginning Balance					480
Charges to Costs and Expenses					0
Charges (Deductions) to Other Accounts					0
Deductions					(480)	[3]
Valuation Allowances and Reserves, Ending balance					0	[3]
Tax Valuation Allowances [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Beginning Balance	3,315		3,587		7,132
Charges to Costs and Expenses	1,120		855		854
Charges (Deductions) to Other Accounts	193	[1],[4]	0		0
Deductions	(901)	[5]	(1,127)	[5]	(4,399)	[5]
Valuation Allowances and Reserves, Ending balance	$ 3,727		$ 3,315		$ 3,587

[1] Foreign currency translation and other adjustments.

[2] Uncollected receivables written off and recoveries.

[3] A reserve for $0.5 million was recorded during 2004 for the remaining balance of the note receivable associated with the sale of certain assets of the fiberboard operation in 2001, which was included within “Prepaid expenses and other current assets” on the Consolidated Balance Sheets as of December 31, 2011. The receivable was written off against the reserve in 2012.

[4] Adjustments relating to the acquisition of Industrial Filtration.

[5] Reduction to income tax expense.