Supplemental Cash Flow Information - Supplemental Information About Cash Flows (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid during the period for interest	$ 68,633	$ 75,684
Cash paid during the period for income taxes, net of refunds of $684 and $3,703	35,826	23,939
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING ACTIVITIES:
Cash paid to reduce accrued obligations for the purchase of property and equipment	3,815	4,849
SUPPLEMENTAL DISCLOSURE OF NONCASH FINANCING ACTIVITIES:
Net settlement of shares used to satisfy payroll tax obligations on the vesting of restricted stock and stock issued from the deferred compensation plan	1,439	709
Accrued dividends	259	854
Accrued deferred financing costs	$ 0	$ 1,079