Debt (Additional Information) (Details) (USD $)	0 Months Ended	3 Months Ended			9 Months Ended										1 Months Ended				9 Months Ended			0 Months Ended	1 Months Ended	9 Months Ended			0 Months Ended
	Nov. 23, 2010	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2011	Sep. 30, 2014	Sep. 30, 2013	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2012	Dec. 31, 2011	Jul. 13, 2011	Dec. 31, 2010	Nov. 23, 2010	Jul. 31, 2011 Credit Agreement [Member]	Jul. 13, 2011 Credit Agreement [Member]	Sep. 30, 2014 Credit Agreement [Member] Maximum [Member]	Sep. 30, 2014 Interest Rate Swap [Member]	Sep. 30, 2014 Bank Term Loan [Member]	Jul. 31, 2013 Bank Term Loan [Member] Cash Flow Hedging [Member]	Jul. 31, 2012 Bank Term Loan [Member] Cash Flow Hedging [Member]	Jul. 13, 2011 Amended Credit Facility [Member]	Jul. 31, 2011 Amended Credit Facility [Member]	Sep. 30, 2014 Amended Credit Facility [Member]	Sep. 30, 2013 Amended Credit Facility [Member]	Jul. 13, 2011 Amended Credit Facility [Member]	Jul. 13, 2011 Amended Credit Facility [Member] Minimum [Member]	Jul. 13, 2011 Amended Credit Facility [Member] Maximum [Member]	Jul. 13, 2011 Amended Credit Facility [Member] Federal Funds Rate [Member]	Jul. 13, 2011 Amended Credit Facility [Member] One Month LIBOR [Member]	Jul. 13, 2011 Amended Credit Facility [Member] Bank Term Loan [Member]	Jul. 13, 2011 Eurocurrency loans [Member] Credit Agreement [Member]
Debt Instrument [Line Items]
Credit agreement, maximum borrowing capacity														$ 165,000,000.0												$ 265,000,000					$ 100,000,000.0
Credit agreement, agreement period																						5 years
Credit agreement, maturity date	Nov. 23, 2014																					Jul. 13, 2016
Reduction in interest costs																										0.25%
Size of permitted acquisitions														25,000,000.0												100,000,000.0
Permitted additional indebtedness														20,000,000.0												120,000,000.0
Revolving credit outstanding borrowings		0			0				0			100,000,000
Variable rate lower range basis spread																0.75%													0.50%
Variable rate higher range basis spread																1.50%														1.00%
Line of credit, interest rate description															The base reference rate is the greater of the prime rate; federal funds effective rate plus 50 basis points; and adjusted London interbank offered (“LIBO”) rate plus 100 basis points.
Line of credit, LIBOR rate, minimum spread																																1.75%
Line of credit, LIBOR rate, maximum spread																																2.50%
Unused commitment fee percentage																											0.20%	0.35%
Payments commencement date																							Sep. 30, 2011
Leverage ratio		0.63			0.63												3
Actual FCCR		2.70	2.23		2.70	2.23	2.65	2.69	2.39
Capitalized debt issuance costs										100,000	700,000		1,600,000
Amortization expense, debt issue costs		100,000	100,000		400,000
Capitalized debt issuance costs, net		900,000			900,000
Amount drawn on the line of credit to fund the acquisition of Curamik				145,000,000
Repayment of debt principal					12,711,000	17,371,000																		12,500,000	16,800,000
Required payment on debt obligation within the next 12 months																								27,500,000
Term loan debt																			65,000,000					65,000,000
LIBOR in Effect at Period End		0.1875%			0.1875%
Interest rate spread over variable rate (percent)					2.00%														2.00%
Irrevocable standby letters of credit		1,400,000			1,400,000
Fair value of interest rate swap liability																		500,000
Option to buy out capital lease, year					2013
Capital lease, expiration date					2021
Capital lease obligation		7,100,000			7,100,000
Amortization expense related to the capital lease		100,000	100,000		300,000	400,000
Capital lease accumulated depreciation		1,500,000			1,500,000				1,200,000
Interest expense on outstanding debt		500,000	500,000		1,400,000	1,700,000
Unused commitment fee		100,000	100,000		300,000	300,000
Interest rate swap derivative, percentage of debt hedged (percent)																				65.00%	65.00%
Interest expense on capital lease		$ 100,000	$ 100,000		$ 400,000	$ 400,000