Long-Term Debt - Financial Covenants Include Required Specified Ratios (Detail)	Sep. 30, 2015
Line Of Credit Facility [Line Items]
Minimum consolidated liquidity ratio	120.00%
Minimum consolidated fixed charge coverage ratio	178.00%
Maximum consolidated total lease adjusted leverage ratio	413.00%
Required Ratio [Member]
Line Of Credit Facility [Line Items]
Minimum consolidated liquidity ratio	105.00%
Minimum consolidated fixed charge coverage ratio	120.00%
Maximum consolidated total lease adjusted leverage ratio	550.00%