Capital Lease Obligations and Other Borrowings - Additional Information (Detail)	Dec. 31, 2013
Credit Facility Short Term Borrowings [Line Items]
Letters of credit issued percentage of cash collateralized basis	100.00%

Letters of credit issued percentage of cash collateralized basis.

No definition available.

Name:	msn_LettersOfCreditIssuedPercentageOfCashCollateralizedBasis
Namespace Prefix:	msn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant