Long-Term Debt, Derivatives and Letters of Credit - Additional Information (Detail) € in Millions		1 Months Ended	7 Months Ended	12 Months Ended
	Dec. 31, 2015 USD ($)	Feb. 29, 2016 USD ($)	Dec. 31, 2015 USD ($)	May. 31, 2015 USD ($)	May. 31, 2014 USD ($)	May. 31, 2013 USD ($)	Dec. 31, 2015 EUR (€)
Line of Credit Facility [Line Items]
Borrowing capacity	$ 150,000,000		$ 150,000,000
Total rent expense from operating leases			18,800,000	$ 29,500,000	$ 26,200,000	$ 23,500,000
Net Investment Hedge [Member]
Line of Credit Facility [Line Items]
Borrowing under credit facility	13,400,000		13,400,000				€ 12.3
Facility and Auto Leases [Member]
Line of Credit Facility [Line Items]
Obligations under non-cancellable operating leases	81,400,000
Standby Letters of Credit [Member]
Line of Credit Facility [Line Items]
Outstanding letter of credit	13,200,000		13,200,000	$ 12,100,000	$ 13,600,000
New Credit Facility [Member]
Line of Credit Facility [Line Items]
Borrowing capacity	$ 500,000,000		$ 500,000,000
Maturity period			2020-07
Credit Facility, Covenant Terms			The New Credit Facility also contains financial covenants requiring the Company to maintain as of the end of each fiscal quarter (i) a maximum ratio of consolidated funded debt to consolidated EBITDA of not more than 4.00 to 1.00 (until August 31, 2016, at which point the ratio will decrease by 0.25 to 1.00 every other quarter until it reaches 3.00 to 1.00), (ii) a maximum ratio of senior secured debt to consolidated EBITDA of not more than 3.00 to 1.00 and (iii) an interest coverage ratio of less than 3.00 to 1.00.
Maximum ratio of consolidated funded debt to consolidated EBITDA	4.00		4.00				4.00
Decrease in ratio of consolidated funded debt to consolidated EBITDA			0.25
Maximum ratio of senior secured debt to consolidated EBITDA	3.00		3.00				3.00
Minimum interest coverage ratio	3.00		3.00				3.00
Available borrowing capacity	$ 36,000,000		$ 36,000,000
Cash on hand	44,800,000		44,800,000
Debt issuance costs			2,000,000
Swing line facility	25,000,000		$ 25,000,000
New Credit Facility [Member] | Eurodollar Libor Rate [Member]
Line of Credit Facility [Line Items]
Basis spread on LIBOR Rate			2.00%
Commitment fees on unused borrowing capacity			0.35%
New Credit Facility [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Swing line facility		$ 35,000,000
New Credit Facility [Member] | Five-year revolving loan facility [Member]
Line of Credit Facility [Line Items]
Borrowing capacity	300,000,000		$ 300,000,000
New Credit Facility [Member] | Five-year term loan facility [Member]
Line of Credit Facility [Line Items]
Borrowing capacity	$ 200,000,000		$ 200,000,000
New Credit Facility [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Borrowing capacity		400,000,000
Increased borrowing capacity		100,000,000
Term Loan Facility [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Borrowing capacity		$ 200,000,000