GOLD LEASE PAYABLE – BANK - Additional Information (Detail) - Shanghai Pudong Development Bank Ltd [Member] ¥ in Millions, $ in Millions	12 Months Ended
Dec. 31, 2016 USD ($) g	Dec. 31, 2016 CNY (¥) g	Dec. 31, 2015 kg
Gold Lease Payable Bank [Line Items]
Gold Lease Outstanding	185,000	185,000	917
Proceeds From Secured Lines Of Credit	$ 7.2	¥ 49.8

The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration