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Long-Term Debt - Additional Information (Details)			6 Months Ended
	Jan. 22, 2023 GBP (£)	Jan. 22, 2016 GBP (£)	Jun. 30, 2018 USD ($)	Dec. 31, 2017
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity			$ 316,700,000
Line of credit facility, maximum borrowing capacity			575,000,000.0
Debt instrument, collateral amount			3,200,000
Standby Letters of Credit
Debt Instrument [Line Items]
Proceeds from lines of credit			$ 15,100,000
2006 Senior Notes Payable Through 2021, 5.41%
Debt Instrument [Line Items]
Debt instrument, stated interest rate percentage			5.41%	5.41%
Senior Revolving Credit Facility Maturing in 2020 | Standby Letters of Credit
Debt Instrument [Line Items]
Proceeds from lines of credit			$ 6,200,000
Line of Credit | Senior Revolving Credit Facility Maturing in 2020 | Revolving Credit Facility
Debt Instrument [Line Items]
Weighted average revolving interest rate, percentage			3.31%
Notes Payable | Multi-currency Notes Due in 2031
Debt Instrument [Line Items]
Aggregate principal amount		£ 54,900,000.0	$ 72,500,000
Debt instrument, stated interest rate percentage		3.40%
Minimum fixed charges coverage ratio (not less than)		1.50
Maximum consolidated leverage ratio (not to exceed)		3.25
Notes Payable | 2006 Senior Notes Payable Through 2021, 5.41%
Debt Instrument [Line Items]
Debt instrument, stated interest rate percentage		5.41%
Federal Funds Open Rate | Line of Credit | Senior Revolving Credit Facility Maturing in 2020 | Revolving Credit Facility
Debt Instrument [Line Items]
Interest rate margin, percentage			0.50%
London Interbank Offered Rate (LIBOR) | Line of Credit | Senior Revolving Credit Facility Maturing in 2020 | Revolving Credit Facility
Debt Instrument [Line Items]
Interest rate margin, percentage			1.00%
Minimum | Line of Credit | Senior Revolving Credit Facility Maturing in 2020 | Revolving Credit Facility
Debt Instrument [Line Items]
Interest rate margin, percentage			0.00%
Maximum | Line of Credit | Senior Revolving Credit Facility Maturing in 2020 | Revolving Credit Facility
Debt Instrument [Line Items]
Interest rate margin, percentage			175.00%
Scenario, Forecast | Notes Payable | Multi-currency Notes Due in 2031
Debt Instrument [Line Items]
Annual installment debt payments	£ 6,100,000.0		$ 8,100,000

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Amount of assets pledged to secure a debt instrument.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
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Face (par) amount of debt instrument at time of issuance.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
-Section 55
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Contractual interest rate for funds borrowed, under the debt agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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