DEBT OBLIGATIONS AND CREDIT FACILITIES - Debt Obligations (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Debt obligations	$ 579,464,000	$ 615,179,000
5.03%
Debt Instrument [Line Items]
Debt obligations	10,714,000	21,429,000
Face Amount	75,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.03%
Debt Instrument, Offering Date	Jun. 30, 2004
Debt Instrument, Date of First Required Payment	Jun. 14, 2008
6.09%
Debt Instrument [Line Items]
Debt obligations	50,000,000	50,000,000
Face Amount	50,000,000
Debt Instrument, Interest Rate, Stated Percentage	6.09%
Debt Instrument, Maturity Date	Jun. 06, 2016
Debt Instrument, Offering Date	Jun. 30, 2006
5.82%
Debt Instrument [Line Items]
Debt obligations	50,000,000	50,000,000
Face Amount	50,000,000
Debt Instrument, Interest Rate, Stated Percentage	5.82%
Debt Instrument, Maturity Date	Nov. 08, 2016
Debt Instrument, Offering Date	Nov. 30, 2006
6.75%
Debt Instrument [Line Items]
Debt obligations	250,000,000	250,000,000
Face Amount	250,000,000
Debt Instrument, Interest Rate, Stated Percentage	6.75%
Debt Instrument, Maturity Date	Dec. 02, 2019
Debt Instrument, Offering Date	Nov. 30, 2009
Term Loan
Debt Instrument [Line Items]
Debt obligations	218,750,000	243,750,000
Face Amount	250,000,000	250,000,000
Loan amortization rate (as a percent)	2.50%	2.50%
Final principal payment	$ 125,000,000
Debt Instrument, Maturity Date	Dec. 21, 2017
Debt Instrument, Offering Date	Dec. 31, 2012