Debt (Additional Information) (Detail) (USD $)	1 Months Ended	3 Months Ended	12 Months Ended			0 Months Ended	1 Months Ended
	Nov. 30, 2010	Mar. 31, 2011	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 13, 2011	Jul. 31, 2011	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2011	Nov. 23, 2010	Jul. 31, 2013	Jul. 31, 2012
Debt Instrument [Line Items]
Credit agreement, maximum borrowing capacity			$ 165,000,000.0									$ 165,000,000
Credit agreement, maturity date	Nov. 23, 2014
Size of permitted acquisitions												25,000,000.0
Permitted additional indebtedness												20,000,000.0
Revolving credit outstanding borrowings						100,000,000.0
Actual leverage ratio			0.55
Actual FCCR			2.58	2.39				2.70	2.65	2.69
Capitalized debt issuance costs				100,000	700,000							1,600,000
Amortization expense, debt issue costs			500,000	500,000	500,000
Capitalized debt issuance costs, net			800,000
Amount drawn on the line of credit to fund the acquisition of Curamik		145,000,000
Repayment of debt principal			17,797,000	21,206,000	25,519,000
Term loan debt						100,000,000
Letter of credit remaining borrowing capacity			1,400,000
Fair value of interest rate swap liability			400,000
Option to buy out capital lease, year			2013
Capital lease, expiration date			2021
Capital lease obligation			6,800,000	8,000,000							12,100,000
Amortization expense related to the capital lease			400,000	400,000	400,000
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation			1,600,000	1,200,000
Interest expense on outstanding debt			1,800,000	2,200,000	2,900,000
Unused commitment fee			400,000	500,000	400,000
LIBOR in Effect at Period End			0.1875%
Interest rate spread over variable rate			1.75%
Interest expense on capital lease			500,000	500,000	600,000
Interest Paid			2,500,000	3,100,000	4,000,000
Credit Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument Lower Range Basis Spread On Variable Rate						0.75%
Debt Instrument Higher Range Basis Spread On Variable Rate						1.50%
Maximum [Member] | Credit Agreement [Member]
Debt Instrument [Line Items]
Leverage ratio						3
Bank Term Loan [Member]
Debt Instrument [Line Items]
Term loan debt			60,000,000
Interest rate spread over variable rate			1.75%
Bank Term Loan [Member] | Cash Flow Hedging [Member]
Debt Instrument [Line Items]
Interest rate swap derivative, percentage of debt hedged													65.00%	65.00%
Amended Credit Facility [Member]
Debt Instrument [Line Items]
Credit agreement, maximum borrowing capacity						265,000,000
Credit agreement, agreement period						5 years
Credit agreement, maturity date							Jul. 13, 2016
Reduction in interest costs						0.25%
Size of permitted acquisitions						100,000,000.0
Permitted additional indebtedness						120,000,000.0
Payments commencement date							Sep. 30, 2011
Repayment of debt principal			17,500,000	20,500,000
Debt payment obligation in 2015			35,000,000
Term loan debt			60,000,000
Amended Credit Facility [Member] | Credit Agreement [Member]
Debt Instrument [Line Items]
Repayments of Lines of Credit				8,000,000
Amended Credit Facility [Member] | Federal Funds Rate [Member]
Debt Instrument [Line Items]
Debt Instrument Lower Range Basis Spread On Variable Rate						0.50%
Amended Credit Facility [Member] | One Month LIBOR [Member]
Debt Instrument [Line Items]
Debt Instrument Higher Range Basis Spread On Variable Rate						1.00%
Amended Credit Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Unused commitment fee percentage							0.20%
Amended Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Unused commitment fee percentage							0.35%
Amended Credit Facility [Member] | Bank Term Loan [Member]
Debt Instrument [Line Items]
Credit agreement, maximum borrowing capacity						$ 100,000,000.0
Eurocurrency loans [Member] | Credit Agreement [Member]
Debt Instrument [Line Items]
Line of credit, LIBOR rate, minimum spread						1.75%
Line of credit, LIBOR rate, maximum spread						2.50%