Long-term Debt and Financing Arrangements - Narrative (Detail)		1 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
	Jul. 07, 2016 USD ($)	Apr. 30, 2017 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016	Jul. 06, 2016 USD ($)	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term debt maturing in 2018					$ 300,000
Long-term debt maturing in 2019					300,000
Long-term debt maturing in 2021					$ 76,600,000
Weight-average interest rate (as a percent)					2.20%	1.40%		1.30%
Minimum
Debt Instrument [Line Items]
Unused borrowing capacity, commitment fee percentage					0.175%
Maximum
Debt Instrument [Line Items]
Unused borrowing capacity, commitment fee percentage					0.30%
Base Rate | Minimum
Debt Instrument [Line Items]
Basis spread (as a percent)					0.15%
Base Rate | Maximum
Debt Instrument [Line Items]
Basis spread (as a percent)					1.00%
Eurocurrency Rate | Minimum
Debt Instrument [Line Items]
Basis spread (as a percent)					0.75%
Eurocurrency Rate | Maximum
Debt Instrument [Line Items]
Basis spread (as a percent)					1.75%
Amended Credit Facility
Debt Instrument [Line Items]
Letters of credit outstanding					$ 3,900,000
Amended Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 175,000,000						$ 100,000,000
Maximum borrowing capacity possible value of increase (not to exceed)	$ 50,000,000
Credit facility fixed charge coverage ratio (not less than)				2.0
Required consolidated leverage ratio as of end of each fiscal quarter			3.0	3.0
Required consolidated EBITDA				$ 30,000,000.0
Remaining borrowing availability					94,500,000
Borrowings outstanding					76,600,000
Amended Credit Facility | Revolving Credit Facility | Federal Funds Effective Swap Rate
Debt Instrument [Line Items]
Basis spread (as a percent)				0.50%
Amended Credit Facility | Revolving Credit Facility | Eurocurrency Rate
Debt Instrument [Line Items]
Basis spread (as a percent)				1.00%
Amended Credit Facility | Foreign Credit Facilities
Debt Instrument [Line Items]
Remaining borrowing availability					9,800,000
Borrowings outstanding					100,000
Letters of credit outstanding					$ 2,800,000
Interest rate contract
Debt Instrument [Line Items]
Term of derivative contract		3 years
Notional amount of derivative		$ 60,000,000.0
Derivative fixed interest rate (as a percent)		1.58%
Derivative quarterly reduction amount			$ 5,000,000.0
Other Foreign Bank Borrowings
Debt Instrument [Line Items]
Maturity					2017
Other Foreign Bank Borrowings | Minimum
Debt Instrument [Line Items]
Effective rate (as a percent)					0.80%
Other Foreign Bank Borrowings | Maximum
Debt Instrument [Line Items]
Effective rate (as a percent)					3.40%
Capital Leases | Minimum
Debt Instrument [Line Items]
Effective rate (as a percent)					1.65%
Maturity					2019
Capital Leases | Maximum
Debt Instrument [Line Items]
Effective rate (as a percent)					2.09%
Maturity					2020