Supplemental Cash Flow Information - Schedule of Supplemental Disclosures Of Cash Flow Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid during the period for interest, net of amounts capitalized	$ 10,839	$ 8,726
Non-cash items:
Accounts receivable/deferred revenue - adjustment		32,848
Prepaid expenses and other current assets/deferred revenue - adjustment		15,756
Prepaid expenses and other current assets - reclassification		7,371
Deferred revenue - current/non-current - reclassification		7,962
Accounts payable/deferred revenue current - reclassification		$ 6,507