DEBT - Additional Information (Detail) - USD ($)	Oct. 16, 2017	Sep. 30, 2017	Jul. 28, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Consolidated leverage ratio, current		350.00%
Maximum consolidated leverage ratio possible on Settlement		400.00%
Minimum consolidated leverage ratio to trigger increase in interest rate			375.00%
Upper range of consolidated leverage ratio to allow increase in interest rate			400.00%
Allowable increment in interest rate on consolidated leverage ratio exceeds 3.75			0.50%
$1.2 billion senior credit facility weighted average rate 2.40%, due in 2019
Debt Instrument [Line Items]
Revolving credit facility, amount committed to outstanding letters of credit		$ 134,200,000		$ 138,000,000
Revolving credit facility, unused portion		712,200,000		$ 654,900,000
Maximum borrowing capacity of line of credit facility		1,200,000,000
$1.2 billion senior credit facility weighted average rate 2.40%, due in 2019 | Subsequent Event
Debt Instrument [Line Items]
Proceeds from line of credit	$ 175,000,000
$175 million private placement notes 3.89%, due in 2017
Debt Instrument [Line Items]
Long-term debt, face amount		$ 175,000,000
$175 million private placement notes 3.89%, due in 2017 | Subsequent Event
Debt Instrument [Line Items]
Repayments of debt	$ 175,000,000