DEBT - Schedule of Long-Term Debt (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Total debt	$ 1,516,092,000	$ 1,659,215,000
Less: current portion of total debt	106,405,000	131,969,000
Long-term portion of total debt	1,409,687,000	1,527,246,000
Obligations under capital leases
Debt Instrument [Line Items]
Total debt	8,390,000	9,185,000
$1.2 billion senior credit facility weighted average rate 1.51%, due in 2019
Debt Instrument [Line Items]
Total debt	176,387,000	459,975,000
Maximum borrowing capacity of line of credit facility	$ 1,200,000,000.0
Long-term Debt, Weighted Average Interest Rate	1.51%
$1.5 billion term loan facility, due in 2020
Debt Instrument [Line Items]
Total debt	$ 0	0
Maximum borrowing capacity of line of credit facility	1,500,000,000.0
$100 million private placement notes 5.64%, due in 2015
Debt Instrument [Line Items]
Total debt	0	100,000,000
$175 million private placement notes 3.89%, due in 2017
Debt Instrument [Line Items]
Total debt	175,000,000	175,000,000
Long-term debt, face amount	$ 175,000,000.0
Stated interest rate	3.89%
$125 million private placement notes 2.68%, due in 2019
Debt Instrument [Line Items]
Total debt	$ 125,000,000	125,000,000
Long-term debt, face amount	$ 125,000,000.0
Stated interest rate	2.68%
$225 million private placement notes 4.47%, due in 2020
Debt Instrument [Line Items]
Total debt	$ 225,000,000	225,000,000
Long-term debt, face amount	$ 225,000,000.0
Stated interest rate	4.47%
$125 million private placement notes 3.26%, due in 2022
Debt Instrument [Line Items]
Total debt	$ 125,000,000	125,000,000
Long-term debt, face amount	$ 125,000,000.0
Stated interest rate	3.26%
$200 million private placement notes 2.72%, due in 2022
Debt Instrument [Line Items]
Total debt	$ 200,000,000	0
Long-term debt, face amount	$ 200,000,000
Stated interest rate	2.72%
$100 million private placement notes 2.79%, due in 2023
Debt Instrument [Line Items]
Total debt	$ 100,000,000	0
Long-term debt, face amount	$ 100,000,000
Stated interest rate	2.79%
Promissory notes and deferred consideration weighted average rate of 3.74% and weighted average maturity of 3.5 years
Debt Instrument [Line Items]
Total debt	$ 271,568,000	279,590,000
Long-term Debt, Weighted Average Interest Rate	3.74%
Long Term Debt Maturity	3 years 6 months
Foreign bank debt weighted average rate 9.20% and weighted average maturity of 2.3 years
Debt Instrument [Line Items]
Total debt	$ 109,747,000	$ 160,465,000
Long-term Debt, Weighted Average Interest Rate	9.20%
Long Term Debt Maturity	2 years 3 months 18 days