Carrying Value and Fair Value of Blackstone Issued Notes (Detail) - Entity [Domain] - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014
6.625% Notes
Debt Instrument [Line Items]
Carrying value of issued notes	[1]	$ 618,812	$ 622,552	[2]
Debt instrument, fair value	[1],[3]	678,776	684,158
5.875% Notes
Debt Instrument [Line Items]
Carrying value of issued notes		397,536	397,357	[2]
Debt instrument, fair value	[3]	460,960	462,360
4.750% Notes
Debt Instrument [Line Items]
Carrying value of issued notes		391,775	391,344	[2]
Debt instrument, fair value	[3]	428,840	436,240
6.250% Notes
Debt Instrument [Line Items]
Carrying value of issued notes		237,564	237,487	[2]
Debt instrument, fair value	[3]	290,850	307,125
5.000% Notes
Debt Instrument [Line Items]
Carrying value of issued notes		488,066	487,966	[2]
Debt instrument, fair value	[3]	497,900	$ 527,500
4.450% Notes
Debt Instrument [Line Items]
Carrying value of issued notes		343,952
Debt instrument, fair value	[3]	318,780
2.000% Notes
Debt Instrument [Line Items]
Carrying value of issued notes		331,929
Debt instrument, fair value	[3]	$ 329,293

[1] The carrying and fair values are determined using the original $600 million par amount less $15 million attributable to these notes which were acquired but not retired by Blackstone during 2012.

[2] The carrying value has been adjusted to reflect the presentation of debt issuance costs as a direct deduction from the related liability for all periods presented in accordance with amended guidance on simplifying the presentation of such costs.

[3] Fair value is determined by broker quote and these notes would be classified as Level II within the fair value hierarchy.