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Income Taxes - Summary of Income Tax Examinations (Detail) | 12 Months Ended
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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

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