Borrowings (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Debt Instrument [Line Items]
Amount oustanding	$ 200,000		$ 220,156
Term Loan
Debt Instrument [Line Items]
Amount oustanding	180,000		200,000
Contractual annualized interest rate	2.08%	[1]
Revolver
Debt Instrument [Line Items]
Amount oustanding	$ 20,000	[2]	$ 20,156	[2]
Contractual annualized interest rate	2.08%	[1],[2]

[1] Both the term and revolver loan rate consisted of a floating Eurodollar base rate 0.58% plus a margin of 1.5%. However, the Company has an interest rate swap contract which converts the floating Eurodollar base rate to a fixed base rate on $200.0 million of borrowings (see below). As a result, the Company's effective annual interest rate on its debt as of December 31, 2011 was 3.76%.

[2] The Company had $376.8 million of available borrowing capacity on the revolver (not including the expansion feature) as of December 31, 2011.