Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities - Significant Non-Cash Investing and Financing Activities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash paid during the period for:
Interest	$ 14,323	$ 14,899
Income taxes	6,922	8,004
Significant non-cash investing and financing activities
Other payable issued for purchased customer accounts	300	5
Estimated acquisition earn-out payables and related charges	606	5,653
Business Acquisition Cost of Entity Note Payable	492	0
Notes received on the sale of fixed assets and customer accounts	$ 0	$ 362