Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities - Significant Non-Cash Investing and Financing Activities (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash paid during the period for:
Interest	$ 33,122	$ 33,091
Income taxes	104,739	96,579
Significant non-cash investing and financing activities
Other payable issued for purchased customer accounts	10,505	995
Estimated acquisition earn-out payables and related charges	3,828	29,497
Business Acquisition Cost of Entity Note Payable	492	0
Notes received on the sale of fixed assets and customer accounts	$ 0	$ 544