XBRL Guidance Series from FASB

To assist in the implementation concerns, FASB has provided the first in a series of guidance.
http://www.complianceweek.com/fasb-kicks-off-xbrl-guidance-series/article/279960/

XBRL error rates

are discussed in this post  http://blogs.wsj.com/cfo/2013/02/08/xbrl-error-rate-seen-as-growing-pains/?mod=wsjpro_hps_cforeport

Columbia Business School's Center for Excellence in Accounting and Security Analysis

 release this report on XBRL  http://datacoalition.blogspot.com/2013/01/connecting-big-business-regulation-to.html

Also linked from the AICPA website http://www.aicpa.org/InterestAreas/FRC/AccountingFinancialReporting/XBRL/Pages/EvaluationofCurrentandFutureStateofXBRL.aspx