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Accounts Receivable, net - Net Accounts Receivables (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Receivables [Abstract]    
Trade receivables $ 94,200 $ 72,505
Insurance claims 1,907 10,059
Other 1,046 873
Accounts receivable, gross 97,153 83,437
Allowance for doubtful accounts (673) (636)
Accounts receivable, net $ 96,480 $ 82,801