Debt - Total Interest Expense and Fees Recognized on Borrowing under New Credit Agreement (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Debt Disclosure [Abstract]
Interest expense and fees	$ 973	$ 1,115	$ 1,986	$ 1,662