Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended	12 Months Ended
	Nov. 30, 2014	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Nov. 14, 2014
Significant Accounting Policies [Line Items]
Cost of sales for equipment sold			$ 84,100,000	$ 13,200,000	$ 7,100,000
Customer payment terms (in days)			14 days
Maximum allocation period (in year)			1 year
Non-cash impairment charge on equity method investment		$ 40,000,000
Capitalized computer software costs			$ 23,400,000	17,700,000	12,800,000
Capitalized computer software amortization expense			$ 11,600,000	9,200,000	7,300,000
Minimum percentage of likelihood required to recognize uncertain income tax position			50.00%
Maturity of cash equivalent, max (in months)			3 months
Foreign exchange gain (loss) recognized			$ (2,400,000)	1,400,000	(400,000)
Deferred financing costs		18,100,000	18,100,000	23,200,000
Maximum undivided ownership interest pooled accounts receivable amount sold			950,000,000
Deferred financing fees						$ 3,100,000
Short-term debt outstanding		614,000,000	614,000,000	675,000,000
Advertising expense			19,900,000	$ 14,400,000	$ 12,300,000
Securitization Facility [Member]
Significant Accounting Policies [Line Items]
Securitized accounts receivable facility		500,000,000	500,000,000
Securitization Facility [Member] | Second Amendment [Member]
Significant Accounting Policies [Line Items]
Securitized accounts receivable facility		$ 950,000,000	$ 950,000,000
New Credit Facility [Member]
Significant Accounting Policies [Line Items]
Debt issuance costs	$ 15,800,000
Debt issuance costs capitalized	$ 9,200,000
Minimum [Member] | Stock Options [Member]
Significant Accounting Policies [Line Items]
Period of vesting provisions (in years)			1 year
Maximum [Member] | Stock Options [Member]
Significant Accounting Policies [Line Items]
Period of vesting provisions (in years)			6 years
Customer Concentration Risk [Member]
Significant Accounting Policies [Line Items]
Period past due for accounts receivable deemed as uncollectible			90 days
Period due for allowance on accounts receivable			90 days
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Significant Accounting Policies [Line Items]
Concentration risk, percentage			98.00%	98.00%