Segment Information - Segment Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Net sales									$ 373,206	$ 370,084	$ 424,691
Interest expense									2,374	3,878	4,715
Depreciation and amortization									16,957	17,643	17,016
Income tax (benefit) expense									8,000	(3,927)	5,168
Net income (loss)	4,485	5,052	4,770	2,871	8,206	3,115	7,038	5,909	17,178	24,268	20,937
Assets	262,402				265,343				262,402	265,343	259,461
Expenditures for long- lived assets	15,250				17,089				15,250	17,089	20,329
Operating Segments [Member] | Metal Bearing Components Segment [Member]
Segment Reporting Information [Line Items]
Net sales									259,459	252,241	308,883
Interest expense									349	387	214
Depreciation and amortization									11,334	12,060	12,295
Income tax (benefit) expense									8,345	2,819	4,785
Net income (loss)									18,519	20,980	30,360
Assets	197,980				198,770				197,980	198,770	188,872
Expenditures for long- lived assets	9,250				14,875				9,250	14,875	11,791
Operating Segments [Member] | Precision Metal Components Segment [Member]
Segment Reporting Information [Line Items]
Net sales									78,756	76,746	72,272
Interest expense
Depreciation and amortization									4,313	4,243	3,346
Income tax (benefit) expense									3,261	(1,811)
Net income (loss)									5,799	9,110	(1,864)
Assets	39,432				40,727				39,432	40,727	47,027
Expenditures for long- lived assets	4,640				1,511				4,640	1,511	7,194
Operating Segments [Member] | Plastic and Rubber Components Segment [Member]
Segment Reporting Information [Line Items]
Net sales									34,991	41,097	43,536
Interest expense
Depreciation and amortization									1,347	1,366	1,371
Income tax (benefit) expense									216	(2,244)
Net income (loss)									383	3,921	2,879
Assets	16,638				19,232				16,638	19,232	19,740
Expenditures for long- lived assets	1,015				703				1,015	703	1,344
Corporate and Consolidations [Member]
Segment Reporting Information [Line Items]
Net sales
Interest expense									2,025	3,491	4,501
Depreciation and amortization									(37)	(26)	4
Income tax (benefit) expense									(3,822)	(2,691)	383
Net income (loss)									(7,523)	(9,743)	(10,438)
Assets	8,352				6,614				8,352	6,614	3,822
Expenditures for long- lived assets	$ 345								$ 345