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Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2016

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Schedule of Defined Benefit Plans Disclosures

	U.S. Pension Benefits								Non-U.S. Pension Benefits								Other Benefits								Total
	2016				2015				2016				2015				2016				2015				2016				2015
Change in benefit obligation:
Benefit obligation at beginning of year	$	154,415			$	164,367			$	818,269			$	863,639			$	3,272			$	3,754			$	975,956			$	1,031,760
Service cost, gross	432				837				29,936				31,514				—				—				30,368				32,351
Interest cost	4,428				6,431				10,664				14,071				76				139				15,168				20,641
Actuarial losses (gains)	845				(10,145		)		42,786				(4,959		)		318				113				43,949				(14,991		)
Plan amendments and other	—				—				—				(12,391		)		150				163				150				(12,228		)
Benefits paid	(21,965		)		(7,075		)		(33,977		)		(49,010		)		(831		)		(897		)		(56,773		)		(56,982		)
Impact of foreign currency	—				—				(29,401		)		(24,595		)		—				—				(29,401		)		(24,595		)
Benefit obligation at end of year	$	138,155			$	154,415			$	838,277			$	818,269			$	2,985			$	3,272			$	979,417			$	975,956
Change in plan assets:
Fair value of plan assets at beginning of year	$	119,118			$	132,030			$	725,597			$	751,193			$	—			$	—			$	844,715			$	883,223
Actual return on plan assets	6,876				(5,907		)		15,927				(2,925		)		—				—				22,803				(8,832		)
Employer contributions	74				70				22,291				22,812				681				734				23,046				23,616
Plan participants’ contributions	—				—				13,277				12,850				150				163				13,427				13,013
Benefits paid	(21,965		)		(7,075		)		(33,977		)		(49,010		)		(831		)		(897		)		(56,773		)		(56,982		)
Impact of foreign currency and other	—				—				(26,946		)		(9,323		)		—				—				(26,946		)		(9,323		)
Fair value of plan assets at end of year	$	104,103			$	119,118			$	716,169			$	725,597			$	—			$	—			$	820,272			$	844,715
Funded status	$	(34,052	)		$	(35,297	)		$	(122,108	)		$	(92,672	)		$	(2,985	)		$	(3,272	)		$	(159,145	)		$	(131,241	)

Schedule of Amounts Recognized in Balance Sheet

	U.S. Pension Benefits								Non-U.S. Pension Benefits								Other Benefits								Total
	2016				2015				2016				2015				2016				2015				2016				2015
Other non-current assets	$	—			$	—			$	10,530			$	32,786			$	—			$	—			$	10,530			$	32,786
Accrued and other liabilities	(92		)		(92		)		(4,293		)		(4,508		)		(467		)		(483		)		(4,852		)		(5,083		)
Pension and other post-retirement liabilities	(33,960		)		(35,205		)		(128,345		)		(120,950		)		(2,518		)		(2,789		)		(164,823		)		(158,944		)
Accumulated other comprehensive loss (income)	69,528				83,347				255,855				216,224				(5,057		)		(9,943		)		320,326				289,628
Total	$	35,476			$	48,050			$	133,747			$	123,552			$	(8,042	)		$	(13,215	)		$	161,181			$	158,387

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	$	—			$	(21,516	)		$	(1,151	)		$	(22,667	)		$	(17,480	)
Actuarial losses (gains)	69,528				277,371				(3,906		)		342,993				254,924
Total	$	69,528			$	255,855			$	(5,057	)		$	320,326			$	237,444

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)	$	1,750			$	60,026			$	319			$	62,095			$	47,788
Amortization of:
Actuarial (losses) gains	(15,569		)		(17,999		)		1,875				(31,693		)		(22,414		)
Plan amendments and prior service cost	—				5,076				2,692				7,768				5,684
Impact of foreign currency	—				(7,472		)		—				(7,472		)		(5,885		)
Total	$	(13,819	)		$	39,631			$	4,886			$	30,698			$	25,173

Schedule of Assumptions Used in Computing Benefit Obligation

	U.S.									Non-U.S.
	2016			2015			2014			2016			2015			2014
Discount rate	3.97	%		4.27	%		4.00	%		0.98	%		1.31	%		1.65	%
Compensation increase rate	n/a			n/a			n/a			0.85	%		1.03	%		1.61	%
Expected long-term rate of return on plan assets	6.75	%		7.25	%		7.50	%		4.09	%		4.58	%		4.82	%

Schedule of Assumptions Used in Computing Pension Cost

	U.S.									Non-U.S.
	2016			2015			2014			2016			2015			2014
Discount rate	4.27	%		4.00	%		4.75	%		1.31	%		1.65	%		2.73	%
Compensation increase rate	n/a			n/a			n/a			1.03	%		1.61	%		1.61	%
Expected long-term rate of return on plan assets	7.25	%		7.50	%		7.50	%		4.58	%		4.82	%		4.87	%

Schedule of Net Benefit Costs [Table Text Block]

Net periodic pension cost and net periodic post-retirement benefit for the defined benefit plans and U.S. post-retirement plan includes the following components for the years ended December 31:

	U.S.												Non-U.S.												Other Benefits												Total
	2016				2015				2014				2016				2015				2014				2016				2015				2014				2016				2015				2014
Service cost, net	$	432			$	837			$	893			$	16,804			$	18,664			$	15,189			$	—			$	—			$	170			$	17,236			$	19,501			$	16,252
Interest cost on projected benefit obligations	4,428				6,431				6,396				10,664				14,071				21,445				76				139				240				15,168				20,641				28,081
Expected return on plan assets	(7,781		)		(9,575		)		(8,549		)		(33,168		)		(36,832		)		(37,361		)		—				—				—				(40,949		)		(46,407		)		(45,910		)
Recognition of actuarial losses/(gains) and prior service costs	7,606				7,626				4,800				12,923				10,639				292				(4,567		)		(5,247		)		(2,215		)		15,962				13,018				2,877
Settlement charge	7,963				—				—				—				—				—				—				—				—				7,963				—				—
Net periodic pension cost / (benefit)	$	12,648			$	5,319			$	3,540			$	7,223			$	6,542			$	(435	)		$	(4,491	)		$	(5,108	)		$	(1,805	)		$	15,380			$	6,753			$	1,300

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	$	—			$	(4,984	)		$	(779	)		$	(5,763	)
Actuarial losses (gains)	6,555				22,236				(1,895		)		26,896
Total	$	6,555			$	17,252			$	(2,674	)		$	21,133

Schedule of Allocation of Plan Assets

	December 31, 2016																December 31, 2015
	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	$	131,468			$	—			$	—			$	131,468			$	86,135			$	—			$	—			$	86,135
Equity Securities:
Mettler-Toledo Stock	2,846				—				—				2,846				3,229				—				—				3,229
Equity Mutual Funds:
U.S.(1)	5,860				24,257				—				30,117				6,320				27,614				—				33,934
International(2)	54,760				52,404				—				107,164				41,982				50,748				—				92,730
Emerging Markets(3)	78,999				793				—				79,792				95,065				774				—				95,839
Fixed Income Securities:
Corporate/Government	69,578				—				—				69,578				91,533				—				—				91,533
Bonds(4)
Fixed Income Mutual Funds:
Insurance Contracts(5)	—				19,955				1,300				21,255				—				20,351				1,367				21,718
Core Bond(6)	121,884				52,955				—				174,839				138,073				37,099				—				175,172
Real Asset Mutual Funds:
Real Estate(7)	69,284				—				—				69,284				65,597				—				—				65,597
Commodities(8)	22,964				—				5,594				28,558				21,092				3,880				33,505				58,477
Other Types of Investments:
Global Allocation Funds(9)	11,981				11,285				—				23,266				12,661				13,605				—				26,266
Total assets in fair value hierarchy	$	569,624			$	161,649			$	6,894			$	738,167			$	561,687			$	154,071			$	34,872			$	750,630
Investments measured at net asset value:
Emerging Markets (3)													4,407																5,343
Multi-Strategy Fund of Hedge Funds (10)													77,698																88,742
Total pension assets at fair value													$	820,272															$	844,715

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

	Commodities				Insurance Contract				Total
Balance at December 31, 2014	$	28,196			$	1,388			$	29,584
Actual return on plan assets:
Related to assets held at end of year	2,408				22				2,430
Purchases	2,911				99				3,010
Impact of foreign currency	(10		)		(142		)		(152		)
Balance at December 31, 2015	$	33,505			$	1,367			$	34,872
Actual return on plan assets:
Related to assets held at end of year	—				25				25
Related to assets sold during the year	(2,857		)		—				(2,857		)
Sales	(21,278		)		(38		)		(21,316		)
Impact of foreign currency	(3,776		)		(54		)		(3,830		)
Balance at December 31, 2016	$	5,594			$	1,300			$	6,894

Schedule of Expected Benefit Payments

	U.S. Pension Benefits				Non-U.S. Pension Benefits				Other Benefits Net of Subsidy				Total
2017	$	7,693			$	40,407			$	467			$	48,567
2018	7,927				40,263				414				48,604
2019	8,120				39,952				381				48,453
2020	8,350				40,919				265				49,534
2021	8,472				39,001				239				47,712
2022-2027	43,902				192,274				860				237,036

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