Borrowings - Additional Information (Detail) $ in Thousands	1 Months Ended		12 Months Ended
	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013	Dec. 09, 2011 USD ($)	Dec. 06, 2010 USD ($)
Line of Credit Facility [Line Items]
Credit facility, term			5 years
Replaced credit facility due to expire			$ 600,000
Revolving facility principal amount			$ 700,000
Revolving facility expiration date			Jun. 23, 2020
Revolving facility, extension term			1 year
Aggregate commitments of designated borrowers under the Credit Facility			$ 350,000
Long-term debt outstanding			847,436	$ 865,626
Other Borrowings
Line of Credit Facility [Line Items]
Other borrowings			$ 2,436	2,170
Other Borrowings | Minimum
Line of Credit Facility [Line Items]
Stated interest rate			0.20%
Other Borrowings | Maximum
Line of Credit Facility [Line Items]
Stated interest rate			2.80%
Letters Of Credit
Line of Credit Facility [Line Items]
Revolving facility principal amount			$ 75,000
Swing line Loans
Line of Credit Facility [Line Items]
Revolving facility principal amount			$ 50,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Applicable margin over LIBOR			1.10%
Basis spread on variable rate			0.20%
Outstanding letters of credit			$ 7,200
Current borrowings under revolving facility			195,000	115,000
Revolving Facility, amount available to borrow			$ 497,800
Stated interest rate			1.51%
Revolving Credit Facility | Minimum
Line of Credit Facility [Line Items]
Applicable margin over LIBOR			0.005%
Interest coverage ratio			3.0
Revolving Credit Facility | Maximum
Line of Credit Facility [Line Items]
Applicable margin over LIBOR			1.50%
Leverage ratio			3.50
2.58% Senior Euro Notes, due June 2015
Line of Credit Facility [Line Items]
Long-term debt outstanding			$ 0	$ 98,456
Stated interest rate			2.58%
Debt instrument maturity period			Jun. 30, 2015	Jun. 30, 2015
4.5% Senior Notes, due December 2020
Line of Credit Facility [Line Items]
Long-term debt outstanding			$ 300,000	$ 300,000
Stated interest rate			4.50%				4.50%
Debt instrument maturity period		Dec. 15, 2020	Dec. 31, 2020	Dec. 31, 2020
Debt instrument face amount							$ 300,000
Net proceeds from debt offering							295,700
Debt offering initial discount							$ 1,600
Debt offering underwriting commission		$ 1,900
Estimated offering expenses		$ 800
Contingent percentage of principal amount plus accrued and unpaid interest		101.00%
Outstanding repayment of indebtedness		$ 250,000
4.2% Senior Notes, due December 2021
Line of Credit Facility [Line Items]
Long-term debt outstanding			$ 350,000	$ 350,000
Principal amount of private placement	$ 350,000
Stated interest rate			4.20%		4.20%	4.20%
Debt instrument maturity period	Dec. 15, 2021		Dec. 31, 2021	Dec. 31, 2021
Net proceeds from debt offering						$ 346,200
Debt offering initial discount						$ 900
Debt offering underwriting commission	$ 2,300
Estimated offering expenses	600
Contingent percentage of principal amount plus accrued and unpaid interest			101.00%
Outstanding repayment of indebtedness	$ 306,000