Multiemployer Defined Benefit Pension Plans Year End for Contributions (Detail)	12 Months Ended
	Oct. 31, 2012
Building Service 32BJ Pension Fund
Defined Benefit Plan Disclosure [Line Items]
Contributions to the plan exceeded more than 5% of total contributions (as of the Plan's year end)	6/30/2011
Local 25 SEIU & Participating Employers Pension Trust
Defined Benefit Plan Disclosure [Line Items]
Contributions to the plan exceeded more than 5% of total contributions (as of the Plan's year end)	9/30/2011 and 9/30/2010
IUOE Stationary Engineers Local 39 Pension Fund
Defined Benefit Plan Disclosure [Line Items]
Contributions to the plan exceeded more than 5% of total contributions (as of the Plan's year end)	12/31/2011 and 12/31/2010
Service Employees International Union Local 32BJ, District 36 Building Operators Pension Trust Fund
Defined Benefit Plan Disclosure [Line Items]
Contributions to the plan exceeded more than 5% of total contributions (as of the Plan's year end)	12/31/2011 and 12/31/2010
IUOE Local 30 Pension Fund
Defined Benefit Plan Disclosure [Line Items]
Contributions to the plan exceeded more than 5% of total contributions (as of the Plan's year end)	12/31/2011 and 12/31/2010