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Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2014

BENEFIT PLANS [Abstract]

Schedule of Defined Benefit Plans Disclosures

	U.S. Pension Benefits								Non-U.S. Pension Benefits								Other Benefits								Total
	2014				2013				2014				2013				2014				2013				2014				2013
Change in benefit obligation:
Benefit obligation at beginning of year	$	138,147			$	156,804			$	814,200			$	798,657			$	5,295			$	11,267			$	957,642			$	966,728
Service cost, gross	893				494				28,579				30,315				170				216				29,642				31,025
Interest cost	6,396				5,755				21,445				19,566				240				405				28,081				25,726
Actuarial losses (gains)	25,848				(18,226		)		117,902				(11,477		)		477				(1,988		)		144,227				(31,691		)
Plan amendments and other	—				—				(453		)		293				(1,951		)		(3,733		)		(2,404		)		(3,440		)
Benefits paid	(6,917		)		(6,680		)		(35,279		)		(43,271		)		(477		)		(872		)		(42,673		)		(50,823		)
Impact of foreign currency	—				—				(82,755		)		20,117				—				—				(82,755		)		20,117
Benefit obligation at end of year	$	164,367			$	138,147			$	863,639			$	814,200			$	3,754			$	5,295			$	1,031,760			$	957,642
Change in plan assets:
Fair value of plan assets at beginning of year	$	117,903			$	94,734			$	786,532			$	731,040			$	—			$	—			$	904,435			$	825,774
Actual return on plan assets	2,974				12,073				40,893				42,480				—				—				43,867				54,553
Employer contributions	18,070				17,776				25,448				25,147				343				723				43,861				43,646
Plan participants’ contributions	—				—				13,409				13,255				134				149				13,543				13,404
Benefits paid	(6,917		)		(6,680		)		(35,279		)		(43,271		)		(477		)		(872		)		(42,673		)		(50,823		)
Impact of foreign currency and other	—				—				(79,810		)		17,881				—				—				(79,810		)		17,881
Fair value of plan assets at end of year	$	132,030			$	117,903			$	751,193			$	786,532			$	—			$	—			$	883,223			$	904,435
Funded status	$	(32,337	)		$	(20,244	)		$	(112,446	)		$	(27,668	)		$	(3,754	)		$	(5,295	)		$	(148,537	)		$	(53,207	)

Schedule of Amounts Recognized in Balance Sheet

	U.S. Pension Benefits								Non-U.S. Pension Benefits								Other Benefits								Total
	2014				2013				2014				2013				2014				2013				2014				2013
Other non-current assets	$	—			$	—			$	38,922			$	105,132			$	—			$	—			$	38,922			$	105,132
Pension and other post-retirement liabilities	(32,337		)		(20,244		)		(151,368		)		(132,800		)		(3,754		)		(5,295		)		(187,459		)		(158,339		)
Accumulated other comprehensive loss (income)	85,636				59,013				213,702				110,965				(15,303		)		(15,910		)		284,035				154,068
Total	$	53,299			$	38,769			$	101,256			$	83,297			$	(19,057	)		$	(21,205	)		$	135,498			$	100,861

Schedule of Net Periodic Benefit Cost Not yet Recognized

	U.S. Pension Benefits				Non-U.S. Pension Benefits				Other Benefits				Total				Total, After Tax
Plan amendments and prior service cost	$	—			$	(19,291	)		$	(4,904	)		$	(24,195	)		$	(18,436	)
Actuarial losses (gains)	85,636				232,993				(10,399		)		308,230				224,481
Total	$	85,636			$	213,702			$	(15,303	)		$	284,035			$	206,045

Schedule of Changes in Accumulated Postemployment Benefit Obligations

	U.S. Pension Benefits				Non-U.S. Pension Benefits				Other Benefits				Total				Total, After Tax
Net actuarial losses (gains)	$	31,423			$	114,370			$	477			$	146,270			$	106,837
Plan amendments and prior service cost, net	—				(526		)		(2,085		)		(2,611		)		(1,607		)
Amortization of:
Actuarial (losses) gains	(4,800		)		(4,308		)		1,436				(7,672		)		(5,310		)
Plan amendments and prior service cost	—				4,016				779				4,795				3,696
Impact of foreign currency	—				(10,815		)		—				(10,815		)		(8,089		)
Total	$	26,623			$	102,737			$	607			$	129,967			$	95,527

Schedule of Assumptions Used in Computing Benefit Obligation

	U.S.									Non-U.S.
	2014			2013			2012			2014			2013			2012
Discount rate	4.00	%		4.75	%		3.75	%		1.65	%		2.73	%		2.50	%
Compensation increase rate	n/a			n/a			n/a			1.61	%		1.61	%		1.60	%
Expected long-term rate of return on plan assets	7.50	%		7.50	%		7.75	%		4.82	%		4.87	%		4.89	%

Schedule of Assumptions Used in Computing Pension Cost

	U.S.									Non-U.S.
	2014			2013			2012			2014			2013			2012
Discount rate	4.75	%		3.75	%		4.25	%		2.73	%		2.50	%		3.10	%
Compensation increase rate	n/a			n/a			n/a			1.61	%		1.60	%		1.75	%
Expected long-term rate of return on plan assets	7.50	%		7.75	%		8.00	%		4.87	%		4.89	%		4.80	%

Schedule of Net Pension Costs

	U.S.												Non-U.S.
	2014				2013				2012				2014				2013				2012
Service cost, net	$	893			$	494			$	455			$	15,189			$	17,386			$	15,011
Interest cost on projected benefit obligations	6,396				5,755				6,093				21,445				19,566				22,104
Expected return on plan assets	(8,549		)		(7,154		)		(6,965		)		(37,361		)		(35,048		)		(32,989		)
Recognition of actuarial losses/(gains) and prior service costs	4,800				7,782				7,664				292				3,545				210
Net periodic pension cost	$	3,540			$	6,877			$	7,247			$	(435	)		$	5,449			$	4,336

Schedule of Net Postretirement Costs

	2014				2013				2012
Service cost	$	170			$	216			$	333
Interest cost on projected benefit obligations	240				405				539
Net amortization and deferral	(2,215		)		(901		)		(753		)
Net periodic post-retirement benefit (credit)/cost	$	(1,805	)		$	(280	)		$	119

Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year

	U.S. Pension Benefits				Non-U.S. Pension Benefits				Other Benefits				Total
Plan amendments and prior service costs	$	—			$	(4,254	)		$	(1,877	)		$	(6,131	)
Actuarial losses (gains)	7,626				16,862				(3,370		)		21,118
Total	$	7,626			$	12,608			$	(5,247	)		$	14,987

Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates

	One-Percentage-Point Increase				One-Percentage-Point Decrease
Effect on total of service and interest cost components	$	32			$	(29	)
Effect on post-retirement benefit obligation	$	25			$	(25	)

Schedule of Allocation of Plan Assets

	December 31, 2014																December 31, 2013
	Quoted Prices in Active Markets for Identical Assets (Level 1)				Observable Inputs for Identical Assets (Level 2)				Unobservable Inputs (Level 3)				Total				Quoted Prices in Active Markets for Identical Assets (Level 1)				Observable Inputs for Identical Assets (Level 2)				Unobservable Inputs (Level 3)				Total
Asset Category:
Cash and Cash Equivalents	$	140,959			$	—			$	—			$	140,959			$	129,932			$	—			$	—			$	129,932
Equity Securities:
Mettler-Toledo Stock	3,638				—				—				3,638				3,425				—				—				3,425
Equity Mutual Funds:
U.S.(1)	7,377				30,268				—				37,645				5,960				27,652				—				33,612
International(2)	39,515				52,476				—				91,991				44,149				54,120				—				98,269
Emerging Markets(3)	72,360				6,679				—				79,039				78,392				5,773				—				84,165
Fixed Income Securities:
Corporate/Government	124,709				—				—				124,709				129,155				—				—				129,155
Bonds(4)
Fixed Income Mutual Funds:
Insurance Contracts(5)	—				23,288				1,388				24,676				—				24,633				1,475				26,108
Core Bond(6)	120,840				38,757				—				159,597				146,857				36,327				—				183,184
Real Asset Mutual Funds:
Real Estate(7)	61,849				—				—				61,849				66,431				—				—				66,431
Commodities(8)	20,920				3,118				28,196				52,234				23,293				3,323				23,136				49,752
Other Types of Investments:
Global Allocation Funds(9)	13,790				12,145				—				25,935				12,002				11,088				—				23,090
Multi-Strategy Fund of	—				—				80,951				80,951				—				—				77,312				77,312
Hedge Funds(10)
	$	605,957			$	166,731			$	110,535			$	883,223			$	639,596			$	162,916			$	101,923			$	904,435

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation

	Multi- Strategy Fund of Hedge Funds				Commodities				Insurance Contract				Total
Balance at December 31, 2012	$	74,985			$	22,986			$	1,726			$	99,697
Actual return on plan assets:
Related to assets held at end of year	1,420				(449		)		69				1,040
Purchases	11,792				—				127				11,919
Sales	(12,691		)		—				(519		)		(13,210		)
Impact of foreign currency	1,806				599				72				2,477
Balance at December 31, 2013	$	77,312			$	23,136			$	1,475			$	101,923
Actual return on plan assets:
Related to assets held at end of year	4,456				2,952				34				7,442
Related to assets sold during the year	4,811				—				—				4,811
Purchases	22,867				5,030				115				28,012
Sales	(21,649		)		—				(54		)		(21,703		)
Impact of foreign currency	(6,846		)		(2,922		)		(182		)		(9,950		)
Balance at December 31, 2014	$	80,951			$	28,196			$	1,388			$	110,535

Schedule of Expected Benefit Payments

	U.S. Pension Benefits				Non-U.S. Pension Benefits				Other Benefits Net of Subsidy				Total
2015	$	7,228			$	39,708			$	579			$	47,515
2016	7,467				39,276				505				47,248
2017	7,842				40,098				464				48,404
2018	8,198				40,073				403				48,674
2019	8,480				40,371				348				49,199
2020-2024	46,986				202,059				1,091				250,136

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