Debt - Additional Information (Detail)							1 Months Ended		3 Months Ended	6 Months Ended		12 Months Ended
	Dec. 31, 2016 USD ($) shares	Dec. 12, 2016 USD ($)	Oct. 21, 2016 USD ($)	Dec. 31, 2015 USD ($)	Oct. 22, 2015 USD ($)	Sep. 01, 2011 USD ($)	Jan. 31, 2017 USD ($) shares	Mar. 31, 2011	Mar. 31, 2017 USD ($)	Jun. 30, 2018 USD ($) $ / shares	Jun. 30, 2017 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2015 EUR (€)	Jun. 30, 2018 EUR (€)	Mar. 07, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($) $ / shares	Dec. 30, 2016 USD ($)	Dec. 31, 2015 EUR (€)
Debt Instrument [Line Items]
Common stock, par value | $ / shares										$ 0.001						$ 0.001
Loss on extinguishment of convertible debt											$ 1,797,000
Carrying amount of financial instruments net of unamortized discount										$ 260,024,000						$ 275,587,000
Borrowings under overdraft agreements										$ 0						0
Zlate Moravce, Slovakia [Member]
Debt Instrument [Line Items]
Interest rate										1.95%
Description about maturity date of debt instrument										loan is due in installments from 2016 through 2020
Loan amount principal outstanding										$ 1,900,000				€ 1,600,000
Newco [Member]
Debt Instrument [Line Items]
Common stock, par value | $ / shares															$ 0.01
GS Term Loans [Member]
Debt Instrument [Line Items]
Maximum amount available															$ 1,340,000,000
GS Revolving Loans [Member]
Debt Instrument [Line Items]
Maximum amount available															$ 300,000,000
Line of Credit [Member] | Multicurrency [Member]
Debt Instrument [Line Items]
Maximum amount available			$ 250,000,000
Convertible Notes [Member]
Debt Instrument [Line Items]
Debt instrument, maturity date								Mar. 01, 2031
Coupon interest rate						2.75%
Proceeds from the offering						$ 81,300,000
Percentage of convertible notes redeemable										100.00%
Surrender of notes for conversion end date										Jan. 09, 2017
Conversion of notes into shares (in shares)		0.390809
Principal amount of notes		$ 1,000
Conversion of notes into shares, amount	$ 39,300,000						$ 44,700,000
Conversion of notes into shares (in shares) | shares	1,500,000						1,700,000
Loss on extinguishment of convertible debt	$ 1,900,000								$ 1,800,000
Carrying amount of financial instruments net of unamortized discount	$ 42,900,000
Redemption of debt							$ 900,000
Convertible Notes [Member] | The Bank of New York Mellon Trust Company, N.A., [Member]
Debt Instrument [Line Items]
Notes redemption date										Jan. 12, 2017
Mortgages [Member] | Heidelberg Germany [Member]
Debt Instrument [Line Items]
Interest rate										1.79%
New mortgage amount				$ 1,700,000						$ 1,300,000		$ 1,700,000		1,100,000				€ 1,500,000
Description about maturity date of debt instrument										The mortgage has an interest rate of 1.79%, which is payable in monthly installments through August 2023.
Mortgages [Member] | Esslingen Germany [Member]
Debt Instrument [Line Items]
Construction loan				6,700,000						$ 7,000,000		$ 6,700,000		5,900,000				6,000,000
Mortgage interest rate												2.50%	2.50%
Monthly installments												$ 100,000	€ 100,000
Mortgages [Member] | Angers France [Member]
Debt Instrument [Line Items]
Interest rate										1.85%
Construction loan				$ 2,300,000						$ 1,800,000		$ 2,300,000		1,500,000				€ 2,100,000
Capital Leases [Member]
Debt Instrument [Line Items]
Principal amount of debt										200,000						200,000
2015 Credit Agreement [Member]
Debt Instrument [Line Items]
Amendment fee included in other non-current assets			600,000
2015 Credit Agreement [Member] | Line of Credit [Member] | 2015 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum amount available					$ 350,000,000												$ 425,000,000
Debt instrument, maturity date					Oct. 22, 2020
Credit facility additional borrowing capacity			$ 75,000,000							150,000,000
Outstanding on revolving credit facility										249,200,000				€ 10,500,000
Amount available under credit facility										171,500,000
2015 Credit Agreement [Member] | Line of Credit [Member] | 2015 Revolving Credit Facility [Member] | Eurodollar Loan [Member]
Debt Instrument [Line Items]
Applicable margins for loans				1.50%
2015 Credit Agreement [Member] | Line of Credit [Member] | 2015 Revolving Credit Facility [Member] | Minimum [Member] | Eurodollar Loan [Member]
Debt Instrument [Line Items]
Applicable margins for loans					1.25%
2015 Credit Agreement [Member] | Line of Credit [Member] | 2015 Revolving Credit Facility [Member] | Minimum [Member] | ABR Based Loans [Member]
Debt Instrument [Line Items]
Applicable margins for loans					0.25%
2015 Credit Agreement [Member] | Line of Credit [Member] | 2015 Revolving Credit Facility [Member] | Maximum [Member] | Eurodollar Loan [Member]
Debt Instrument [Line Items]
Applicable margins for loans					2.00%
2015 Credit Agreement [Member] | Line of Credit [Member] | 2015 Revolving Credit Facility [Member] | Maximum [Member] | ABR Based Loans [Member]
Debt Instrument [Line Items]
Applicable margins for loans					1.00%
2015 Credit Agreement [Member] | Line of Credit [Member] | Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding										4,300,000						$ 3,500,000
2015 Credit Agreement [Member] | Domestic Line of Credit | 2015 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Outstanding on revolving credit facility										$ 236,900,000
Interest rate										3.60%
2015 Credit Agreement [Member] | Foreign Line of Credit [Member] | 2015 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Outstanding on revolving credit facility										$ 12,300,000
Interest rate										2.10%