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Other Assets - Summary of Other Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid expenses $ 4,538 $ 4,338
Interest rate swaps 3,211 5,783
Other investments 6,778 7,221
Other assets 10,790 6,490
Total $ 25,317 $ 23,832