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Other long-term liabilities - Schedule of Long-Term Liabilities and Deferred Credits (Detail) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Other Long-term Liabilities |  |
Advances in aid of construction | $ 62,664 | $ 60,828
Environmental remediation obligation | 66,446 | 58,061
Asset retirement obligations | 54,794 | 53,879
Customer deposits | 31,708 | 31,946
Unamortized investment tax credits | 18,051 | 18,234
Deferred credits | 18,856 | 18,952
Contingent development support obligations | 10,898 | 9,446
Preferred shares, Series C | 12,975 | 13,793
Lease liabilities | 14,248 | 9,695
Other | 29,293 | 26,506
Other long-term liabilities | 319,933 | 301,340
Less: current portion | (56,944) | (57,939)
Other long-term liabilities, excluding current | $ 262,989 | $ 243,401

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