Taxes on Income - Roll-Forward of Total Amounts of Company's Unrecognized Tax Benefits (Parenthetical) (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Short term liabilities	$ 5,275,000	$ 3,274,000	$ 3,348,000

Unrecognized Tax Benefit Classified As Short Term Liability

No definition available.

Name:	orbk_UnrecognizedTaxBenefitClassifiedAsShortTermLiability
Namespace Prefix:	orbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant