The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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Business and Geographic Segments - Schedule of Business Segment Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net sales:
Total net sales	$ 24,700us-gaap_SalesRevenueNet	$ 26,500us-gaap_SalesRevenueNet	$ 26,800us-gaap_SalesRevenueNet	$ 25,800us-gaap_SalesRevenueNet	$ 22,300us-gaap_SalesRevenueNet	$ 24,200us-gaap_SalesRevenueNet	$ 24,000us-gaap_SalesRevenueNet	$ 21,500us-gaap_SalesRevenueNet	$ 103,846us-gaap_SalesRevenueNet	$ 92,045us-gaap_SalesRevenueNet	$ 83,196us-gaap_SalesRevenueNet
Operating income (loss):
Total operating income	3,000us-gaap_OperatingIncomeLoss	3,400us-gaap_OperatingIncomeLoss	3,900us-gaap_OperatingIncomeLoss	3,300us-gaap_OperatingIncomeLoss	2,000us-gaap_OperatingIncomeLoss	3,000us-gaap_OperatingIncomeLoss	2,900us-gaap_OperatingIncomeLoss	1,400us-gaap_OperatingIncomeLoss	13,607us-gaap_OperatingIncomeLoss	9,328us-gaap_OperatingIncomeLoss	5,418us-gaap_OperatingIncomeLoss
Other non-operating income, net									66us-gaap_OtherNonoperatingIncomeExpense	40us-gaap_OtherNonoperatingIncomeExpense
Interest expense										(127)us-gaap_InterestExpense	(479)us-gaap_InterestExpense
Income from continuing operations before income taxes									13,673	9,241	4,939
Depreciation and amortization									3,533	3,270	5,772
Total capital expenditure									2,825	3,501	4,477
Corporate
Operating income (loss):
Total operating income									(5,838)	(6,666)	(7,906)
Depreciation and amortization									30	69	63
Total capital expenditure									4	20	14
Security Products \| Operating Segments
Net sales:
Total net sales									91,470	81,510	73,715
Operating income (loss):
Total operating income									18,740	16,142	14,143
Depreciation and amortization									2,771	2,460	2,618
Total capital expenditure									2,571	3,171	2,029
Marine Components \| Operating Segments
Net sales:
Total net sales									12,376	10,535	9,481
Operating income (loss):
Total operating income									705	(148)	(819)
Depreciation and amortization									732	741	687
Total capital expenditure									250	310	713
Furniture Components \| Operating Segments
Operating income (loss):
Depreciation and amortization											2,404
Total capital expenditure											$ 1,721