Income Taxes - Tax Years Remaining Subject to Examination (Details)	12 Months Ended
	Dec. 31, 2017
Minimum | Federal
Income Tax Contingency [Line Items]
Tax years that remain subject to examination	2014
Minimum | State and Local Income Tax
Income Tax Contingency [Line Items]
Tax years that remain subject to examination	2007
Minimum | Foreign Tax Authority | Canada and Puerto Rico
Income Tax Contingency [Line Items]
Tax years that remain subject to examination	2013
Maximum | Federal
Income Tax Contingency [Line Items]
Tax years that remain subject to examination	2017
Maximum | State and Local Income Tax
Income Tax Contingency [Line Items]
Tax years that remain subject to examination	2017
Maximum | Foreign Tax Authority | Canada and Puerto Rico
Income Tax Contingency [Line Items]
Tax years that remain subject to examination	2017