Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Non-cash investing and financing activities:
Fixed assets acquired with accounts payable or accrued liabilities	$ 24,121	$ 13,113
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	6,236	3,820
Financing cash flows from finance leases	0	2,190
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	21,602	15,984
Finance leases	$ 0	$ 51,064