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Other long-term liabilities - Schedule of Other Long-Term Liabilities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Other Liabilities Disclosure [Abstract]      
Advances in aid of construction $ 60,106   $ 63,703
Environmental remediation obligation 57,854   55,621
Asset retirement obligations 45,535   43,291
Customer deposits 30,329   29,974
Unamortized investment tax credits 17,688   17,491
Deferred credits 35,325   42,711
Preferred shares, Series C 13,860   13,418
Lease liabilities (note 1(c)) 10,388 $ 8,295  
Lease liabilities (note 1(c))     3,436
Other 33,829   36,274
Other liabilities 304,914   305,919
Less: current portion (43,787)   (42,337)
Other long-term liabilities $ 261,127   $ 263,582