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Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities -Significant Non-Cash Investing and Financing Activities (Detail) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Supplemental Cash Flow Elements [Abstract]    
Interest $ 5,230,000 $ 4,827,000
Income taxes 1,532,000 5,379,000
Other payable issued for purchased customer accounts   172,000
Estimated acquisition earn-out payables and related charges 280,000 (721,000)
Notes received on the sale of fixed assets and customer accounts $ 131,000 $ 126,000