Long-Term Debt - Financial Covenants Include Required Specified Ratios (Detail)	Dec. 31, 2016
Line Of Credit Facility [Line Items]
Minimum consolidated liquidity ratio	117.00%
Minimum consolidated fixed charge coverage ratio	192.00%
Maximum consolidated total lease adjusted leverage ratio	408.00%
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	575.00%