Income Taxes - Summary of Tax Years that Remain Subject to Examination by Major Jurisdiction (Detail)	9 Months Ended
	Sep. 30, 2015
United States - Federal [Member] | United States [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2013 - 2014
Examination in progress	N/A
United States - State [Member] | United States [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2010 - 2014
Examination in progress	N/A
Foreign Tax Authority [Member] | Canada [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2010 - 2014
Examination in progress	N/A
Foreign Tax Authority [Member] | Germany [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2012 - 2014
Examination in progress	2007 - 2011
Foreign Tax Authority [Member] | France [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2013 - 2014
Examination in progress	2011 - 2012
Foreign Tax Authority [Member] | United Kingdom [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2013 - 2014
Examination in progress	N/A
Foreign Tax Authority [Member] | Philippines [Member]
Income Tax Examination [Line Items]
Examinations not yet initiated	2012, 2014
Examination in progress	2013