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Summary of Anti-Dilutive Securities (Detail)
|
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2012
|
Jun. 30, 2011
|
Jun. 30, 2012
|
Jun. 30, 2011
|
|
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||||
| Weighted-Average Blackstone Holdings Partnership Units, Anti-dilutive | 591,155,160 | 625,526,089 | 596,986,114 | 641,817,877 |