Related Party Transactions - Additional Information (Detail) (USD $)	1 Months Ended						12 Months Ended
	Feb. 28, 2011	Jan. 31, 2011	Jun. 30, 2010	Aug. 31, 2012	Mar. 31, 2012	Mar. 02, 2010	Mar. 31, 2013 Amount owed from Emerson to Brighton Marketing Limited	Mar. 31, 2012 Amount owed from Emerson to Brighton Marketing Limited	Mar. 31, 2013 Grande Properties Management Limited	Mar. 31, 2012 Grande Properties Management Limited	Mar. 31, 2012 Grande Group (HK) Ltd.	Mar. 31, 2013 Lafe Strategic Services Limited	Mar. 31, 2013 Mr. Eduard Will, a director of Emerson	Mar. 31, 2012 Mr. Eduard Will, a director of Emerson	Mar. 31, 2013 Vigers Appraisal & Consulting Ltd	Mar. 31, 2012 Vigers Appraisal & Consulting Ltd	Apr. 29, 2013 Subsequent Event Grande	Apr. 02, 2013 Subsequent Event Deutsche Bank and S & T International Distribution Limited
Related Party Transaction [Line Items]
Grande's (Provisional Liquidator Appointed) Ownership Interest in Emerson number of shares																	15,243,283
Grande's (Provisional Liquidator Appointed) Ownership Interest Percentage																	56.20%
Number of securities pledged by major shareholder																		3,380,079
Service charge from related party							$ 5,000	$ 31,000	$ 41,000	$ 32,000	$ 19,000
Amount owed to related party					11,000						1,000			10,000
Rental income												27,000
Amount receivable from related party															1,000	1,000
Security deposit paid at inception of agreement												6,000
Notice period to cancel rental agreement												1 month
Consulting fees paid to related party													110,000	60,000
Expense reimbursements and advances paid to related party													23,000	21,000
Extraordinary dividend declared						$ 1.10
Company's assertion as to the percent of the dividend that is taxable to the recipient						4.90%
Internal Revenue Service's assertion as to the percent of the dividend that is taxable to the recipient, which the company is refuting				100.00%
Reimbursement of legal fees			42,000
Agreement transaction fees			33,000
Waive of legal charges		5,000
Receipts from related party for amount owned	70,000
Amount invoiced to related party															$ 4,000	$ 4,000