Earnings Per Share (Details Textual)	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Line Items]
Income Tax Expense Benefit Percentage	39.90%	40.85%
Valuation Allowance Percentage	100.00%

This element represents percentage of income tax (benefit) expense is calculated using an assumed tax rate.

No definition available.

Name:	zais_IncomeTaxExpenseBenefitPercentage
Namespace Prefix:	zais_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration