Debt (Detail) - Borrowings (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013		Mar. 07, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Amount Outstanding	$ 205,000			$ 205,000
Term loans
Debt Instrument [Line Items]
Amount Outstanding	146,250	[1]	150,000	150,000	[1]
Contractual Annualized Interest Rate	1.62%	[1]
Revolver loans
Debt Instrument [Line Items]
Amount Outstanding	53,750	[1],[2]	50,000	50,000	[1],[2]
Contractual Annualized Interest Rate	1.62%	[1],[2]
Other
Debt Instrument [Line Items]
Amount Outstanding	$ 5,000	[3]		$ 5,000	[3]
Contractual Annualized Interest Rate	3.00%	[3]

[1] Both the term and revolver loan rates consisted of a floating Eurodollar base rate of 0.24% plus a margin of 1.38%. However, the Company has an interest rate swap contract which converts the floating Eurodollar base rate to a 2.26% fixed base rate on the first $200.0 million of Company borrowings (see below). As a result, the Company’s effective annual interest rate on the $200.0 million of outstanding term and revolver debt as of September 30, 2013, including the swap and margin, was 3.64%.

[2] The Company had approximately $543.0 million of available borrowing capacity on the revolver (not including the expansion feature) as of September 30, 2013.

[3] The Company borrowed $5.0 million through a State of Connecticut economic development program in December 2012. The loan has a 10 year maturity and bears a 3.0% fixed rate of interest. Principal payments are deferred for the first five years and the loan may be repaid at any point by the Company without penalty. The loan has a principal forgiveness provision in which up to $2.5 million of the loan may be forgiven if the Company meets certain employment targets in Connecticut during the first five years of the loan.