Redemption Prices Expressed as Percentages of Principal Amount (Detail) (7.875% senior notes, due 2021)	Dec. 31, 2013
7.875% senior notes, due 2021
Debt Instrument [Line Items]
2016	105.906%
2017	103.938%
2018	101.969%
2019 and thereafter	100.00%

Percentage of Debt Instrument Redemption Price in Year Seven and Thereafter

No definition available.

Name:	ston_PercentageOfDebtInstrumentRedemptionPriceInYearSevenAndThereafter
Namespace Prefix:	ston_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant