GOODWILL AND OTHER INTANGIBLE ASSETS (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Goodwill [Roll Forward]
Beginning balance	$ 188,110
Acquired during the period	184,719
Translation adjustment	0
Ending balance	372,829
Other Intangibles Assets [Roll Forward]
Balance at beginning of period	69,722
Acquired during the year	86,406
Translation adjustment	23
Amortization	(9,223)	(5,787)
Balance at end of period	146,928
Total Goodwill and Intangible Assets [Roll Forward]
Beginning Balance	257,832
Acquired during the year	271,125
Translation adjustment	23
Amortization	(9,223)	(5,787)
Ending Balance	519,757
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	200,616		114,132
Accumulated amortization	(53,688)		(44,410)
Carrying amount, net	146,928		69,722
Service Centers [Member]
Goodwill [Roll Forward]
Beginning balance			142,714
Ending balance	191,592		142,714
Innovative Pumping Solutions [Member]
Goodwill [Roll Forward]
Beginning balance			28,258
Ending balance	164,099		28,258
Supply Chain Services [Member]
Goodwill [Roll Forward]
Beginning balance			17,138
Ending balance	17,138		17,138
Vendor Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	2,496		2,496
Accumulated amortization	(1,268)		(1,205)
Carrying amount, net	1,228		1,291
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	196,381		109,897
Accumulated amortization	(51,488)		(42,468)
Carrying amount, net	144,893		67,429
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,739		1,739
Accumulated amortization	(932)		(737)
Carrying amount, net	$ 807		$ 1,002