Debt (Detail) - Borrowings (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Debt Instrument [Line Items]
Amount Outstanding	$ 370,000		$ 205,000
Term loans
Debt Instrument [Line Items]
Amount Outstanding	135,000	[1]	144,375	[1]
Revolver loans
Debt Instrument [Line Items]
Amount Outstanding	230,000	[1],[2]	55,625	[1],[2]
Other
Debt Instrument [Line Items]
Amount Outstanding	$ 5,000	[3]	$ 5,000	[3]

[1] The contractual annualized interest rates as of September 30, 2014 on the term loan and the revolver ranged from 1.53% to 1.61%, which consists of a floating Eurodollar base rate ranging from 0.15% to 0.23% plus a margin of 1.38%. However, the Company has an interest rate swap contract which converts the floating Eurodollar base rates to a 2.26% fixed base rate on the first $200.0 million of Company borrowings (see below) and, combined with the 1.38% margin, results in an effective rate of approximately 3.63% on the first $200.0 million of borrowings. The annual effective rate on the Company's total debt outstanding as of September 30, 2014, including the effect of the swap, was approximately 3.64%.

[2] The Company had $366.6 million of available borrowing capacity on the revolver (not including the expansion feature) as of September 30, 2014.

[3] The Company borrowed $5.0 million in 2012 through a State of Connecticut economic development program. 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.