Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Supplemental Cash Flow Information [Abstract]
Taxes paid	$ 71,746	$ 114,601	$ 51,231
Non-cash investing and financing activities:
Fixed assets acquired with accounts payable or accrued liabilities	16,488	15,069	15,105
Conversion Of Convertible Notes Receivable Into Equity Securities	0	4,862	0
Fair value of option to purchase property	0	0	3,936
Notes Issued, Issued In Sale Of Equity Method Investment	54,154	$ 0	$ 0
Operating Lease, Payments	26,337
Finance Lease Purchase Payment Related To Third Party Lease	10,896
Finance Lease, Principal Payments	45,773
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	32,723
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 51,064