FAIR VALUE - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 investment	Sep. 30, 2012	Sep. 30, 2013 Level III [Member]	Dec. 31, 2012 Level III [Member]	Sep. 30, 2013 Level II [Member] Swaps (net)-corporate debt [Member]	Dec. 31, 2012 Level II [Member] Swaps (net)-corporate debt [Member]	Sep. 30, 2013 Level II [Member] Foreign exchange contract [Member]	Dec. 31, 2012 Level II [Member] Foreign exchange contract [Member]	Sep. 30, 2013 Level II [Member] Total Return Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt obligations					$ 624,700,000	$ 652,900,000
Debt, weighted average interest rate (as a percent)					3.20%	3.10%
Percentage increase in average borrowing rate assumption that would lower fair value of debt obligation					10.00%
Fair value of debt obligation, decrease in value due to increase in average borrowing rate					617,000,000
Percentage decrease in average borrowing rate assumption that would increase fair value of debt obligation					10.00%
Fair value of debt obligation, increase in value due to decrease in average borrowing rate					632,600,000
Derivative Fair Value							4,900,000	7,900,000
Foreign exchange contracts									1,400,000	800,000
Transfers between Level I and Level II during the period	0
Transfers betwen level II and Level I during the period		17,600,000	1,066,800,000	17,600,000
Number of investments (in investments)			1
Derivative assets											$ 100,000