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Notes Payable - Additional Information (Detail) (USD $)
 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
Interest Rate Forward Swap [Member]
2023 Notes [Member]
Contract
Oct. 16, 2013
Interest Rate Forward Swap [Member]
2023 Notes [Member]
Jun. 30, 2014
Interest Rate Forward Swap [Member]
2024 Notes [Member]
Contract
Jun. 10, 2014
Interest Rate Forward Swap [Member]
2024 Notes [Member]
Jun. 30, 2014
Unsecured Debt [Member]
Jun. 30, 2014
Unsecured Debt [Member]
Senior Notes [Member]
Jun. 30, 2014
Unsecured Debt [Member]
Senior Notes [Member]
2023 Notes [Member]
Oct. 16, 2013
Unsecured Debt [Member]
Senior Notes [Member]
2023 Notes [Member]
Jun. 30, 2014
Unsecured Debt [Member]
Senior Notes [Member]
2024 Notes [Member]
Jun. 10, 2014
Unsecured Debt [Member]
Senior Notes [Member]
2024 Notes [Member]
Jun. 30, 2014
Unsecured Debt [Member]
$500 million unsecured revolving credit faciltiy [Member]
Aug. 07, 2013
Unsecured Debt [Member]
$500 million unsecured revolving credit faciltiy [Member]
Dec. 13, 2013
Colonial [Member]
Unsecured Debt [Member]
6.25% Senior Notes due 2014 [Member]
Dec. 13, 2013
Colonial [Member]
Unsecured Debt [Member]
5.5% Senior Notes due 2015 [Member]
Dec. 13, 2013
Colonial [Member]
Unsecured Debt [Member]
6.05% Senior Notes due 2016 [Member]
Dec. 13, 2013
Limited Partner [Member]
Jun. 30, 2014
Limited Partner [Member]
Unsecured Debt [Member]
Exchange Notes [Member]
Dec. 13, 2013
Limited Partner [Member]
Unsecured Debt [Member]
6.25% Senior Notes due 2014 [Member]
Dec. 13, 2013
Limited Partner [Member]
Unsecured Debt [Member]
5.5% Senior Notes due 2015 [Member]
Dec. 13, 2013
Limited Partner [Member]
Unsecured Debt [Member]
6.05% Senior Notes due 2016 [Member]
Jun. 30, 2014
Designated as Hedging Instrument [Member]
Interest Rate Swap [Member]
Contract
Jun. 30, 2014
Designated as Hedging Instrument [Member]
Interest Rate Caps
Contract
Jun. 30, 2014
Not Designated as Hedging Instrument [Member]
Interest Rate Caps
Contract
Jun. 30, 2014
Minimum [Member]
Unsecured Debt [Member]
Senior Notes [Member]
Jun. 30, 2014
Minimum [Member]
Unsecured Debt [Member]
$500 million unsecured revolving credit faciltiy [Member]
Jun. 30, 2014
Maximum [Member]
Unsecured Debt [Member]
Senior Notes [Member]
Jun. 30, 2014
Maximum [Member]
Unsecured Debt [Member]
$500 million unsecured revolving credit faciltiy [Member]
Debt Instrument [Line Items]                                                          
Notes Payable $ 3,475,413,000 $ 3,470,000,000         $ 1,912,399,000                                            
Debt Instrument, Face Amount                   350,000,000   400,000,000   500,000,000                              
Debt Instrument, Basis Spread on Variable Rate                                                     0.90%   1.70%
Debt Instrument, Interest Rate at Period End                         1.10%                                
Line of Credit Facility, Amount Outstanding 35,000,000                                                        
Debt Instrument, Interest Rate, Stated Percentage                   4.30%   3.75%     6.25% 5.50% 6.05%     6.25% 5.50% 6.05%              
Debt Instrument, Issue Price                   0.99047   0.98873                                  
Debt Instrument, Unamortized Discount                   3,300,000   4,500,000                                  
Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions                 2,300,000   2,600,000                                    
Proceeds from Notes Payable                 344,400,000   392,900,000                                    
Number of Interest Rate Derivatives Held     3   5                                                
Derivative, Notional Amount     150,000,000   250,000,000                                   675,000,000 165,000,000 90,326,031        
Debt Instrument, Interest Rate, Effective Percentage 3.80%     4.15%   3.98% 4.00%                                            
Aggregate Principal Amount of Notes Exchanged                             154,200,000 169,200,000 68,100,000     154,200,000 169,100,000 68,100,000              
Cash Received from Notes Exchange                                   $ 975,000                      
Debt Instrument, Interest Rate, Additional Interest, Maximum                                     0.50%                    
Exchange Period                                     270 days                    
Covenant Obligation, Debt to Total Asset Value               60.00%                                          
Covenant Obligation, Secured Debt to Total Asset Value Ratio               40.00%                                          
Covenant Obligation, Fixed Charge Ratio                                                   150.00%   100.00%  
Covenant Obligation, Unencumbered Leverage Ratio               150.00%                                          
Derivative, Number of Instruments Held                                             11 6 14