DEBT - Schedule of Long-Term Debt (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Total debt	$ 3,129,099,000	$ 3,214,048,000
Less: current portion of total debt	109,868,000	161,409,000
Less: unamortized debt issuance costs	10,643,000	12,287,000
Long-term portion of total debt	3,008,588,000	3,040,352,000
Obligations under capital leases
Debt Instrument [Line Items]
Total debt	13,574,000	15,024,000
$1.20 billion senior credit facility weighted average rate 1.97%, due in 2019
Debt Instrument [Line Items]
Total debt	531,065,000	353,763,000
Maximum borrowing capacity of line of credit facility	$ 1,200,000,000
Long-term Debt, Weighted Average Interest Rate	1.97%
$1.0 billion term loan weighted average rate 1.83%, due in 2020
Debt Instrument [Line Items]
Total debt	$ 1,000,000,000	1,250,000,000
Maximum borrowing capacity of line of credit facility	$ 1,000,000,000
Stated interest rate	1.83%
$175 million private placement notes 3.89%, due in 2017
Debt Instrument [Line Items]
Total debt	$ 175,000,000	175,000,000
Stated interest rate	3.89%
Long-term debt, face amount	$ 175,000,000
$125 million private placement notes 2.68%, due in 2019
Debt Instrument [Line Items]
Total debt	$ 125,000,000	125,000,000
Stated interest rate	2.68%
Long-term debt, face amount	$ 125,000,000
$225 million private placement notes 4.47%, due in 2020
Debt Instrument [Line Items]
Total debt	$ 225,000,000	225,000,000
Stated interest rate	4.47%
Long-term debt, face amount	$ 225,000,000
$150 million private placement notes 2.89%, due in 2021
Debt Instrument [Line Items]
Total debt	$ 150,000,000	150,000,000
Stated interest rate	2.89%
Long-term debt, face amount	$ 150,000,000
$125 million private placement notes 3.26%, due in 2022
Debt Instrument [Line Items]
Total debt	$ 125,000,000	125,000,000
Stated interest rate	3.26%
Long-term debt, face amount	$ 125,000,000
$200 million private placement notes 2.72%, due in 2022
Debt Instrument [Line Items]
Total debt	$ 200,000,000	200,000,000
Stated interest rate	2.72%
Long-term debt, face amount	$ 200,000,000
$100 million private placement notes 2.79%, due in 2023
Debt Instrument [Line Items]
Total debt	$ 100,000,000	100,000,000
Stated interest rate	2.79%
Long-term debt, face amount	$ 100,000,000
$150 million private placement notes 3.18%, due in 2023
Debt Instrument [Line Items]
Total debt	$ 150,000,000	150,000,000
Stated interest rate	3.18%
Long-term debt, face amount	$ 150,000,000
Promissory notes and deferred consideration weighted average rate of 2.44% and weighted average maturity of 3.1 years
Debt Instrument [Line Items]
Total debt	$ 229,310,000	239,731,000
Long-term Debt, Weighted Average Interest Rate	2.44%
Long Term Debt Maturity	3 years 1 month 6 days
Foreign bank debt weighted average rate 7.82% and weighted average maturity of 2.3 years
Debt Instrument [Line Items]
Total debt	$ 105,150,000	$ 105,530,000
Long-term Debt, Weighted Average Interest Rate	7.82%
Long Term Debt Maturity	2 years 3 months 18 days