XML 19 R54.htm IDEA: XBRL DOCUMENT v2.4.1.9
Accounts Payable and Accrued Expenses - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Payables And Accruals [Abstract]  
Other deferred revenue related to contract $ 1.5evc_DeferredRevenueOther