Income Taxes - Summary of Income Tax Examinations (Detail)	12 Months Ended
	Dec. 31, 2014
Australia [Member]
Open Tax Years By Major Jurisdiction [Line Items]
Earliest tax year subject to audit	2005
Austria [Member]
Open Tax Years By Major Jurisdiction [Line Items]
Earliest tax year subject to audit	2008
Belgium [Member]
Open Tax Years By Major Jurisdiction [Line Items]
Earliest tax year subject to audit	2008
Netherlands [Member]
Open Tax Years By Major Jurisdiction [Line Items]
Earliest tax year subject to audit	2009
Singapore [Member]
Open Tax Years By Major Jurisdiction [Line Items]
Earliest tax year subject to audit	2007
Switzerland [Member]
Open Tax Years By Major Jurisdiction [Line Items]
Earliest tax year subject to audit	2011
United States [Member]
Open Tax Years By Major Jurisdiction [Line Items]
Earliest tax year subject to audit	2005