Borrowings (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2011		Dec. 31, 2010
Debt Instrument [Line Items]
Amount oustanding	$ 220,000		$ 220,156
Term Loan
Debt Instrument [Line Items]
Amount oustanding	190,000		200,000
Contractual annualized interest rate	2.25%	[1]
Revolver
Debt Instrument [Line Items]
Amount oustanding	$ 30,000	[2]	$ 20,156	[2]
Contractual annualized interest rate	2.21%	[1],[2]

[1] The term loan rate consisted of a 0.25% Eurodollar base rate plus a margin of 2.00%, while the revolver rate consisted of a weighted-average Eurodollar base rate of 0.21% plus a margin of 2.00%. 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 June 30, 2011 on $200.0 million of these borrowings was 4.26%.

[2] The Company had $367.0 million of available borrowing capacity on the revolver (not including the expansion feature) as of June 30, 2011.