Valuation and Qualifying Accounts (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Valuation and Qualifying Accounts Disclosure [Line Items]
Accounts receivable, less allowance for doubtful accounts	$ 2,912	$ 4,118
Allowance for Doubtful Accounts
Valuation and Qualifying Accounts Disclosure [Line Items]
Accounts receivable, less allowance for doubtful accounts	$ 1,000