Accrued Expenses and Other Current Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accrued Expenses and Other Current Liabilities [Line Items]
Employee compensation and benefits	$ 26,253	$ 20,585
Dividend payable		2,727
Other	2,328	3,903
Accrued expenses and other current liabilities	33,879	32,276
Scarborough
Accrued Expenses and Other Current Liabilities [Line Items]
Royalties due to Scarborough	$ 5,298	$ 5,061