INVESTMENTS IN GOLD - Additional Information (Detail) ¥ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2018 CNY (¥)	Dec. 31, 2017 USD ($) kg	Oct. 10, 2018 g	Sep. 30, 2018 g	Sep. 30, 2018 kg	Sep. 30, 2018 CNY (¥)	Jun. 08, 2017 kg	Feb. 20, 2017 kg	Jan. 13, 2017 kg
Schedule of Investments [Line Items]
Gold Lease Outstanding				5,356	4,974	57,476
Gold Pledged For Bank Loan			59,523
Proceeds from Secured Lines of Credit		¥ 500.0	$ 2,000,000,000
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax | $	$ 56,900,000
Investment in Physical Commodities | $	1,071,005,836		957,124,267
Debt Instrument, Collateral Amount	1,953,600,000		$ 2,131,600,000				¥ 635.9
Investments [Member]
Schedule of Investments [Line Items]
Investment in Physical Commodities | $	77,000,000
Wuhan Kangbo Biotech Limited [Member]
Schedule of Investments [Line Items]
Gold Lease Outstanding			10,225			2,655			4,755	5,470
Wuhan Huatuan Technology Development Limited [Member]
Schedule of Investments [Line Items]
Gold Lease Outstanding						523		523
Proceeds from Secured Lines of Credit | ¥		¥ 100.0
Long-term Debt [Member]
Schedule of Investments [Line Items]
Gold Pledged For Bank Loan			26,689			60,654
Long-term Debt [Member] | Non current Investments [Member]
Schedule of Investments [Line Items]
Gold Pledged For Bank Loan						32,593
Short-term Debt [Member]
Schedule of Investments [Line Items]
Gold Pledged For Bank Loan			43,582			28,061
Investment in Physical Commodities | $	$ 922,100,000		$ 1,562,900,000