REMEDIAL LIABILITIES (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year	$ 128,007
Measurement period adjustments from prior period acquisitions	504
Accretion	2,342
Changes in estimates recorded to statement of operations	133
Expenditures	(5,292)
Currency translation and other	465
Balance at end of year	126,159
Remedial Liabilities for Landfill Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year	1,777
Measurement period adjustments from prior period acquisitions	0
Accretion	43
Changes in estimates recorded to statement of operations	(36)
Expenditures	(19)
Currency translation and other	(1)
Balance at end of year	1,764
Remedial Liabilities for Inactive Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year	64,151
Measurement period adjustments from prior period acquisitions	0
Accretion	1,332
Changes in estimates recorded to statement of operations	(120)
Expenditures	(2,068)
Currency translation and other	2,712
Balance at end of year	66,007
Remedial Liabilities (Including Superfund) for Non-Landfill Operations
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year	62,079
Measurement period adjustments from prior period acquisitions	504
Accretion	967
Changes in estimates recorded to statement of operations	289
Expenditures	(3,205)
Currency translation and other	(2,246)
Balance at end of year	$ 58,388