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Subsequent Events - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
Oct. 15, 2020
Oct. 01, 2020
Sep. 15, 2020
Sep. 01, 2020
Aug. 14, 2020
Jul. 31, 2020
Jul. 21, 2020
Jun. 15, 2020
Apr. 15, 2020
Mar. 16, 2020
Jan. 15, 2020
Dec. 16, 2019
Oct. 15, 2019
Sep. 16, 2019
Jul. 15, 2019
Jun. 17, 2019
Apr. 15, 2019
Mar. 15, 2019
Jan. 15, 2019
Jun. 30, 2020
Subsequent Event [Line Items]                                        
Restructuring and Related Cost, Number of Positions Eliminated, Inception to Date Percent                                       15.00%
Restructuring and Related Cost, Expected Cost                                       $ 9
Series A Preferred Limited Partners [Member]                                        
Subsequent Event [Line Items]                                        
Preferred Limited Partnership Unit; Distribution Amount Declared               $ 36.875       $ 36.875       $ 36.875        
Series B Preferred Limited Partners [Member]                                        
Subsequent Event [Line Items]                                        
Preferred Limited Partnership Unit; Distribution Amount Declared               $ 0.4922   $ 0.4922   $ 0.4922   $ 0.4922   $ 0.4922   $ 0.4922    
Series C Preferred Limited Partners [Member]                                        
Subsequent Event [Line Items]                                        
Preferred Limited Partnership Unit; Distribution Amount Declared                 $ 0.4969   $ 0.4969   $ 0.4969   $ 0.4969   $ 0.4969   $ 0.5576  
Subsequent Event [Member]                                        
Subsequent Event [Line Items]                                        
Distribution Made to Limited Partner, Distributions Declared, Per Unit             $ 0.39                          
Distribution Made to Common Unitholders, Declaration Date             Jul. 21, 2020                          
Distribution Made to Limited Partner, Date of Record           Jul. 31, 2020                            
Distribution Made to Limited Partner, Distribution Date         Aug. 14, 2020                              
Subsequent Event [Member] | Series B Preferred Limited Partners [Member]                                        
Subsequent Event [Line Items]                                        
Distribution Made to Common Unitholders, Declaration Date             Jul. 21, 2020                          
Preferred Limited Partner Distribution: Record Date       Sep. 01, 2020                                
Preferred Limited Partnership Distribution; Distribution Date     Sep. 15, 2020                                  
Preferred Limited Partnership Unit; Distribution Amount Declared             $ 0.4922                          
Subsequent Event [Member] | Series C Preferred Limited Partners [Member]                                        
Subsequent Event [Line Items]                                        
Distribution Made to Common Unitholders, Declaration Date             Jul. 21, 2020                          
Preferred Limited Partner Distribution: Record Date   Oct. 01, 2020                                    
Preferred Limited Partnership Distribution; Distribution Date Oct. 15, 2020                                      
Preferred Limited Partnership Unit; Distribution Amount Declared             $ 0.4969