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Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Supplemental Cash Flow Information [Abstract]
Taxes paid	$ 114,601	$ 51,231	$ 47,289
Non-cash investing and financing activities:
Fixed assets acquired with accounts payable or accrued liabilities	15,069	15,105	4,434
Conversion Of Convertible Notes Receivable Into Equity Securities	4,862	0	0
Fair value of option to purchase property	$ 0	$ 3,936	$ 0

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Conversion Of Convertible Notes Receivable Into Equity Securities

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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Value of property contributed in noncash investing and financing activities.

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