Debt (Detail) - Borrowings (USD $) In Thousands, unless otherwise specified	Jun. 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	148,125	150,000	150,000
Contractual Annualized Interest Rate	1.65%
Revolver loans
Debt Instrument [Line Items]
Amount Outstanding	51,875		50,000
Contractual Annualized Interest Rate	1.65%
Other
Debt Instrument [Line Items]
Amount Outstanding	$ 5,000		$ 5,000
Contractual Annualized Interest Rate	3.00%