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Taxes on Income - Taxes on Income Included in Statements of Operations (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current:      
Total-Current $ 3,987us-gaap_CurrentIncomeTaxExpenseBenefit $ 8,485us-gaap_CurrentIncomeTaxExpenseBenefit $ 5,896us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:      
Total-Deferred (568)us-gaap_DeferredIncomeTaxExpenseBenefit (1,558)us-gaap_DeferredIncomeTaxExpenseBenefit (5,440)us-gaap_DeferredIncomeTaxExpenseBenefit
Actual tax expense 3,419us-gaap_IncomeTaxExpenseBenefit 6,927us-gaap_IncomeTaxExpenseBenefit 456us-gaap_IncomeTaxExpenseBenefit
Israel [Member]      
Current:      
Total-Current (665)us-gaap_CurrentIncomeTaxExpenseBenefit
/ us-gaap_IncomeTaxAuthorityAxis
= country_IL
(78)us-gaap_CurrentIncomeTaxExpenseBenefit
/ us-gaap_IncomeTaxAuthorityAxis
= country_IL
578us-gaap_CurrentIncomeTaxExpenseBenefit
/ us-gaap_IncomeTaxAuthorityAxis
= country_IL
Deferred:      
Total-Deferred 954us-gaap_DeferredIncomeTaxExpenseBenefit
/ us-gaap_IncomeTaxAuthorityAxis
= country_IL
255us-gaap_DeferredIncomeTaxExpenseBenefit
/ us-gaap_IncomeTaxAuthorityAxis
= country_IL
(4,985)us-gaap_DeferredIncomeTaxExpenseBenefit
/ us-gaap_IncomeTaxAuthorityAxis
= country_IL
Non-Israeli [Member]      
Current:      
Total-Current 4,652us-gaap_CurrentIncomeTaxExpenseBenefit
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
8,563us-gaap_CurrentIncomeTaxExpenseBenefit
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
5,318us-gaap_CurrentIncomeTaxExpenseBenefit
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
Deferred:      
Total-Deferred $ (1,522)us-gaap_DeferredIncomeTaxExpenseBenefit
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
$ (1,813)us-gaap_DeferredIncomeTaxExpenseBenefit
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
$ (455)us-gaap_DeferredIncomeTaxExpenseBenefit
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember