Borrowings (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2011		Dec. 31, 2010
Debt Instrument [Line Items]
Amount oustanding	$ 210,000		$ 220,156
Term Loan
Debt Instrument [Line Items]
Amount oustanding	185,000		200,000
Annualized interest rate	1.87%	[1]
Revolver
Debt Instrument [Line Items]
Amount oustanding	$ 25,000	[2]	$ 20,156	[2]
Annualized interest rate	1.80%	[1],[2]

[1] The contractual rate on the term loan consisted of a 0.37% Eurodollar base rate plus a margin of 1.50%, while the contractual rate on the revolver consisted of a weighted-average Eurodollar base rate of 0.30% plus a margin of 1.50%. The Company has an interest rate swap contract which converts the floating Eurodollar base rate to a fixed base rate of 2.26% on $200.0 million of borrowings (see below). Including the impact of the swap, the annualized effective interest rate as of September 30, 2011 on $200.0 million of these borrowings was 3.76%.

[2] The Company had $371.9 million of available borrowing capacity on the revolver (not including the expansion feature) as of September 30, 2011.