Accounts Receivable - Accounts Receivable, Net of Allowances (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 95,515	$ 118,138
Less: allowance for doubtful accounts, returns and discounts	(9,595)	(8,252)
Accounts Receivable, Net, Current, Total	$ 85,920	$ 109,886