Annual report pursuant to Section 13 and 15(d)

Investment in Joint Ventures - Summary of Revenues, Expenses and Cash Flows Arising from Off-Balance Sheet Arrangements (Detail)

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Investment in Joint Ventures - Summary of Revenues, Expenses and Cash Flows Arising from Off-Balance Sheet Arrangements (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]      
Other operating income $ 44,447 $ 34,487 $ 28,167
General and administrative 50,031 43,103 38,659
Equity in income of joint ventures 3,314 3,665 3,405
Distributions from unconsolidated joint venture 7,055 5,207 4,821
Advances to joint ventures 174 294 346
Investment in unconsolidated joint ventures 69,911 6,438 6,151
Unconsolidated Joint Ventures [Member]      
Schedule of Equity Method Investments [Line Items]      
Other operating income 8,090 4,891 4,889
General and administrative 1,192 1,214 1,053
Equity in income of joint ventures 3,314 3,665 3,405
Distributions from unconsolidated joint venture 7,055 5,207 4,821
Advances to joint ventures (174) (294) (346)
Investment in unconsolidated joint ventures $ (69,911) $ (6,438) $ (6,151)