Related Party Information - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended		0 Months Ended			12 Months Ended	0 Months Ended			12 Months Ended	0 Months Ended
	Feb. 28, 2014	Dec. 20, 2013 WHQ Development [Member]	Feb. 10, 2014 Parent Company [Member]	Jan. 02, 2014 Parent Company [Member]	Sep. 30, 2013 Parent Company [Member]	Feb. 28, 2014 Parent Company [Member]	Jan. 02, 2014 Parent Company [Member] Koch Preferred Stock Investment [Member]	Sep. 30, 2013 Parent Company [Member] Koch Preferred Stock Investment [Member]	Feb. 10, 2014 Senior PIK Toggle Notes [Member] Parent Company [Member]	Feb. 28, 2014 Senior PIK Toggle Notes [Member] Parent Company [Member]	Mar. 26, 2014 Subsequent Event [Member] WHQ Development [Member] acre	Mar. 26, 2014 Subsequent Event [Member] Master Lease Agreement [Member] WHQ Development [Member]	Mar. 26, 2014 Subsequent Event [Member] WHQ Building Lease Agreement [Member] WHQ Development [Member] sqft	Mar. 18, 2014 Subsequent Event [Member] Private Development Agreement [Member] WHQ Development [Member]	Mar. 26, 2014 Subsequent Event [Member] Management And Leasing Agreement [Member] WHQ Development [Member]	Mar. 26, 2014 Subsequent Event [Member] Extension Retail Ground Lease [Member] WHQ Development [Member]	Mar. 26, 2014 Subsequent Event [Member] Extension Apartment Ground Lease [Member] WHQ Development [Member]
Related Party Transaction [Line Items]
Purchase price of land											$ 7,390
Area of land purchased											14.48
Purchase price of land per acre											510,000
Refundable earnest money		815
Equity interest held by unconsolidated related party in development project owner											37.00%
Percentage of fee for construction agency services											0.50%
Maximum fee for construction agency services											250
Expected lease term												75 years	15 years		15 years	2 years 6 months	2 years 6 months
Headquarters building square footage													600,000
Developer fee to be paid														2,000
Annual Operating & Maintenance fee to be paid														750
Future base sales price of ground lease property																277	277
Annual interest rate on base sales price of ground lease property																2.00%	2.00%
Cash dividends paid to parent	75,420		50,000	7,225	18,195	75,420	7,225
Cash dividends paid by parent on its preferred stock								4,212
Aggregate principal amount of Senior PIK Toggle notes									285,000
Cash interest rate percentage									9.75%
PIK interest rate percentage									10.50%
PIK interest description										PIK Interest (as defined below), which is the cash interest rate plus 75 basis points.
Debt instrument variable rate									0.75%
Future annual PIK cash interest payments									$ 27,800