CONSOLIDATION, NONCONTROLLING INTERESTS AND BASIS OF PRESENTATION - Additional Information (Detail) (USD $)			1 Months Ended					1 Months Ended
	Feb. 29, 2012	May 31, 2011	Feb. 29, 2012 Kemrock Industries and Exports Limited	Dec. 31, 2011 Kemrock Industries and Exports Limited	Oct. 31, 2011 Kemrock Industries and Exports Limited	Sep. 30, 2011 Kemrock Industries and Exports Limited	May 31, 2011 Kemrock Industries and Exports Limited	Dec. 31, 2011 Kemrock global depository receipts
Basis of Presentation [Line Items]
Advances to affiliate				$ 15,000,000	$ 12,000,000
Agreement expiration period			Sep. 15, 2012
Inventory	517,172,000	463,120,000	4,600,000
Proceeds from affiliate			5,000,000
Purchase of global depository receipt, shares						870,000	3,200,000	693,072
Purchase of global depository receipt, value								$ 7,200,000