CONTINGENCIES AND COMMITMENTS (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014
Loss Contingencies [Line Items]
Surety Bond Outstanding		$ 52,900,000
Loss Contingency, Damages Sought, Value	1,000,000,000
Standby Letters Of Credit [Member]
Loss Contingencies [Line Items]
Letters of Credit Outstanding, Amount	47,200,000	54,300,000
Financial Standby Letter of Credit [Member]
Loss Contingencies [Line Items]
Letters of Credit Outstanding, Amount	23,200,000	20,700,000
Failure to Meet Contractual Obligations [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value		25,000,000
Loss Contingency, Range of Possible Loss, Minimum		0
Loss Contingency, Range of Possible Loss, Maximum		$ 40,000,000