Income Taxes - Open Tax Years - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2015
Netherlands tax authority [Member]
Income Tax Examination [Line Items]
Open tax year	2013
Earliest Tax Year [Member] | State tax jurisdictions [Member]
Income Tax Examination [Line Items]
Open tax year	2010
Earliest Tax Year [Member] | Internal Revenue Service [Member]
Income Tax Examination [Line Items]
Open tax year	2012
Earliest Tax Year [Member] | Spanish tax authority [Member]
Income Tax Examination [Line Items]
Open tax year	2010
Earliest Tax Year [Member] | Italian tax authority [Member]
Income Tax Examination [Line Items]
Open tax year	2010
Latest Tax Year [Member] | State tax jurisdictions [Member]
Income Tax Examination [Line Items]
Open tax year	2014
Latest Tax Year [Member] | Internal Revenue Service [Member]
Income Tax Examination [Line Items]
Open tax year	2014
Latest Tax Year [Member] | Spanish tax authority [Member]
Income Tax Examination [Line Items]
Open tax year	2014
Latest Tax Year [Member] | Italian tax authority [Member]
Income Tax Examination [Line Items]
Open tax year	2014