Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred Costs, Leasing, Net [Abstract]
Amortization of initial direct costs	$ 8,000	$ 10,000	$ 11,000
Initial direct costs included in rental property and equipment	$ 20,000	22,000
Marketing and Advertising Expense [Abstract]
Capitalization period for deferred marketing costs	8 years
Deferred costs expensed	$ 18,000	23,000	27,000
Deferred marketing costs included in other assets	43,000	49,000
Cash and cash equivalents	650,557	1,054,118	886,788	$ 901,843
Short-term investments	117,021	49,135	$ 52,146
Accounts receivable (net of allowance of $9,262 and $10,742, respectively)	457,327	437,275
Accounts payable and accrued liabilities	1,448,321	1,572,971
Other noncurrent liabilities	605,310	682,646
Deferred taxes on income	$ 205,668	114,950
Minimum
Property, Plant and Equipment [Line Items]
Finite-lived intangible assets, estimated useful lives	3 years
Maximum
Property, Plant and Equipment [Line Items]
Finite-lived intangible assets, estimated useful lives	15 years
Buildings
Property, Plant and Equipment [Line Items]
Estimated useful lives	50 years
Machinery and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Machinery and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	15 years
Rental equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	4 years
Rental equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	6 years
Computer equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Computer equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years
Software development costs | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Software development costs | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives	10 years
Restatement Adjustment
Marketing and Advertising Expense [Abstract]
Cash and cash equivalents		(25,000)
Short-term investments		17,000
Other corporate assets		8,000
Accounts receivable (net of allowance of $9,262 and $10,742, respectively)		23,000
Accounts payable and accrued liabilities		14,000
Other noncurrent liabilities		9,000
New Accounting Pronouncement, Early Adoption, Effect | Restatement Adjustment
Marketing and Advertising Expense [Abstract]
Current income tax assets		(12,000)
Current income tax liabilities		(60,000)
Noncurrent income taxes		2,000
Deferred taxes on income		$ 50,000
Other Assets
Marketing and Advertising Expense [Abstract]
Debt issuance cost	$ 18,000