Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Summary of Reconciliation of Noncontrolling Interests (Detail)

v3.8.0.1
Summary of Significant Accounting Policies - Summary of Reconciliation of Noncontrolling Interests (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Redeemable Noncontrolling Interest Equity Fair Value [Abstract]      
Beginning balance $ 18,091 $ 18,171  
Redemption of units   (4,795)  
Issuance of units   9,516  
Net income attributable to noncontrolling interests in Operating Partnership 444 398 $ 553
Distributions (859) (742)  
Adjustment to redemption value 1,697 (4,457) 3,328
Ending balance $ 19,373 $ 18,091 $ 18,171