Reconciliation of Asset Retirement Obligations which are Included in Other Liabilities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	$ 5,461	$ 4,934
Changes in estimates	0	33
Liabilities incurred	226	121
Liabilities settled	(228)	0
Acquisitions of properties	(2,508)	(16)
Accretion expense	446	357
Balance at end of period	$ 8,413	$ 5,461