Investment in Non-Consolidated Joint Venture - Additional Information (Detail) (USD $)	3 Months Ended								12 Months Ended			1 Months Ended	4 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	Sep. 30, 2014	Dec. 31, 2014	Aug. 29, 2014
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Net sales	$ 153,761,000	$ 125,632,000	$ 106,680,000	$ 102,528,000	$ 90,081,000	$ 93,023,000	$ 96,305,000	$ 93,797,000	$ 488,601,000	$ 373,206,000	$ 370,084,000
Net income	1,619,000	(3,840,000)	5,200,000	5,238,000	4,485,000	5,052,000	4,770,000	2,871,000	8,217,000	17,178,000	24,268,000
Joint Venture [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Acquired investment in joint venture	49.00%								49.00%				49.00%	49.00%
Dividend declared by joint venture	0								0				0
Dividend receivable, year	2015								2015				2015
Withholding tax levied by Chinese government									10.00%
Autocam [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Net income									3,686,000			3,686,000
Autocam [Member] | Joint Venture [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Net sales									50,466,000				36,000
Amount due from joint venture	154,000								154,000				154,000
Net income									9,004,000
Income Approach Valuation Technique [Member] | Equity Method Investments [Member] | Joint Venture [Member]
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Joint venture investment, fair value														35,595,000