Borrowings (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011
Debt Instrument [Line Items]
Amount outstanding	$ 200,000		$ 200,000
Term Loan
Debt Instrument [Line Items]
Amount outstanding	165,000	[1]	180,000	[1]
Contractual annualized interest rate	1.96%	[1]
Revolver
Debt Instrument [Line Items]
Amount outstanding	$ 35,000	[1],[2]	$ 20,000	[1],[2]
Contractual annualized interest rate	1.96%	[1],[2]

[1] The term and revolver contractual rates consisted of a 0.46%, three-month floating Eurodollar base rate plus a margin of 1.50%. However, the Company has an interest rate swap contract which converts the floating Eurodollar base rates 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 total debt outstanding as of June 30, 2012 was approximately 3.62%.

[2] The Company had $361.8 million of additional borrowing capacity on the revolver (not including the expansion feature) as of June 30, 2012.