Segment Information - Segment Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Revenues from external customers	$ 106,680	$ 96,305	$ 209,208	$ 190,102
Net income (loss)	5,200	4,770	10,438	7,641
Total assets	307,420	261,439	307,420	261,439	262,402
Metal Bearing Components Segment [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	73,038	65,869	143,938	129,557
Net income (loss)	5,808	4,847	11,764	8,871
Total assets	227,313	189,756	227,313	189,756
Precision Metal Components Segment [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	25,267	21,543	49,005	42,286
Net income (loss)	1,457	1,819	3,098	2,868
Total assets	54,529	41,484	54,529	41,484
Plastic and Rubber Components Segment [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	8,375	8,893	16,265	18,259
Net income (loss)	267	201	418	460
Total assets	17,718	19,909	17,718	19,909
Corporate and Consolidations [Member]
Segment Reporting Information [Line Items]
Revenues from external customers
Net income (loss)	(2,332)	(2,097)	(4,842)	(4,558)
Total assets	$ 7,860	$ 10,290	$ 7,860	$ 10,290