Long-Term Cash Incentive Plan - Additional Information (Detail) - USD ($) $ in Millions		12 Months Ended
	Feb. 12, 2016	Dec. 31, 2016	Dec. 31, 2015
Long Term Incentive Plan 2016
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Estimated payment of plan including employer cost		$ 5.5
Deferred Compensation Cash-based Arrangements, Liability, Current and Noncurrent		$ 1.9
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