Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities - Significant Non-Cash Investing and Financing Activities (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash paid during the period for:
Interest	$ 18,770	$ 18,766
Income taxes	71,466	67,457
Significant non-cash investing and financing activities
Other payable issued for purchased customer accounts	10,500	905
Estimated acquisition earn-out payables and related charges	2,393	27,134
Business Acquisition Cost of Entity Note Payable	492	0
Notes received on the sale of fixed assets and customer accounts	$ 0	$ 544