LONG-TERM DEBT, DERIVATIVES AND LETTERS OF CREDIT - Additional Information (Detail) € in Millions		3 Months Ended	7 Months Ended	12 Months Ended
	Jul. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	May 31, 2015 USD ($)	Dec. 31, 2017 EUR (€)	Feb. 29, 2016 USD ($)	May 31, 2014 USD ($)
Line of Credit Facility [Line Items]
Borrowing capacity								$ 600,000,000
Commitment fees on unused borrowing capacity				0.75%
Senior Secured Leverage Ratio				3.53			3.53
Interest Coverage Ratio				3.03			3.03
Cash on hand			$ 44,825,000	$ 26,552,000	$ 46,216,000	$ 33,211,000			$ 34,656,000
Available borrowing capacity				41,000,000
Write-off of deferred loan costs			$ 0	$ 1,244,000	0	$ 0
LIBOR
Line of Credit Facility [Line Items]
Basis spread on variable rate				3.75%
Net investment hedge
Line of Credit Facility [Line Items]
Borrowing under credit facility				$ 14,800,000			€ 12.3
Credit Facility
Line of Credit Facility [Line Items]
Write-off of deferred loan costs		$ 1,200,000
Unamortized debt issuance costs				$ 2,100,000
Convertible Debt
Line of Credit Facility [Line Items]
Debt Instrument, Term				72 months
Issuance of convertible debt, face amount	$ 230,000,000
Interest rate on convertible debt	5.00%			5.00%			5.00%
Unamortized debt issuance costs				$ 6,820,000
March 31, 2019 and thereafter
Line of Credit Facility [Line Items]
Minimum interest coverage ratio				2.50			2.50
December 31, 2017
Line of Credit Facility [Line Items]
Maximum ratio of senior secured debt to consolidated EBITDA				4.25			4.25
Minimum interest coverage ratio				3.00			3.00
September 30, 2019 and thereafter
Line of Credit Facility [Line Items]
Maximum ratio of senior secured debt to consolidated EBITDA				2.75			2.75
June 30, 2019
Line of Credit Facility [Line Items]
Maximum ratio of senior secured debt to consolidated EBITDA				3.50			3.50
March 31, 2019
Line of Credit Facility [Line Items]
Maximum ratio of senior secured debt to consolidated EBITDA				3.50			3.50
December 31, 2018
Line of Credit Facility [Line Items]
Maximum ratio of senior secured debt to consolidated EBITDA				3.50			3.50
Minimum interest coverage ratio				2.25			2.25
September 30, 2018
Line of Credit Facility [Line Items]
Maximum ratio of senior secured debt to consolidated EBITDA				3.50			3.50
Minimum interest coverage ratio				2.25			2.25
June 30, 2018
Line of Credit Facility [Line Items]
Maximum ratio of senior secured debt to consolidated EBITDA				4.25			4.25
Minimum interest coverage ratio				2.25			2.25
March 31, 2018
Line of Credit Facility [Line Items]
Maximum ratio of senior secured debt to consolidated EBITDA				4.25			4.25
Minimum interest coverage ratio				2.25			2.25
Standby Letters of Credit
Line of Credit Facility [Line Items]
Outstanding letter of credit				$ 22,500,000	$ 21,600,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Borrowing capacity				$ 300,000,000				400,000,000
Debt Instrument, Term				5 years
Term Loan Facility
Line of Credit Facility [Line Items]
Borrowing capacity								$ 200,000,000
Debt Instrument, Term				5 years
Repayment of term loan	$ 160,000,000
Swing Line Facility
Line of Credit Facility [Line Items]
Borrowing capacity				$ 35,000,000