Long-Term Cash Incentive Plan - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)
Long Term Incentive Plan 2016
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Estimated payment of plan including employer cost	$ 5.6
Long Term Incentive Plan 2013
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Estimated payment of plan including employer cost	4.8
Deferred compensation cash-based arrangements, liability, current and noncurrent	$ 4.8