Debt - Schedule Of Required Covenants Credit Agreement Compared To Actual Amounts (Detail)	9 Months Ended
	Sep. 30, 2016
Requirement [Member]
Debt Instrument [Line Items]
Minimum fixed charge coverage ratio	1.15%
Maximum Leverage Ratio	4.50%
Secured leverage ratio	2.00%
Actual [Member]
Debt Instrument [Line Items]
Minimum fixed charge coverage ratio	2.86%
Maximum Leverage Ratio	2.15%
Secured leverage ratio	0.66%