Unconsolidated Investments - Summary of Aggregated Operating Results of Unconsolidated Joint Ventures (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Schedule of Equity Method Investments [Line Items]        
Revenue $ 40,863 $ 35,697 $ 167,426 $ 122,483
Cost of revenue 21,552 20,444 62,561 48,120
Operating expenses 2,675 3,133 8,734 8,447
Other expense 21,553 31,476 89,820 59,925
Net income (loss) (4,917) (19,356) 6,311 5,991
South Kent [Member]        
Schedule of Equity Method Investments [Line Items]        
Revenue 15,128 17,137 65,033 69,883
Cost of revenue 7,888 8,518 22,663 23,640
Operating expenses 879 1,056 2,916 3,763
Other expense 7,319 19,727 40,276 39,159
Net income (loss) $ (958) $ (12,164) $ (822) $ 3,321