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Schedule V - Valuation Allowances and Qualifying Accounts (Detail) (Allowance for Doubtful Accounts [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance for Doubtful Accounts [Member]
     
Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning Balance $ 530 $ 715 $ 111
Charges to Earnings 428 319 650
Charges to Other Accounts         
Deductions 512 504 46
Ending Balance $ 446 $ 530 $ 715