Other Matters - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Selling, General and Administrative Expenses
Other Matters [Line Items]
Wrote off uncollectible accounts			$ 16.0
Professional Fees	$ 9.6	$ 14.3	11.1
Mr. Cole's Agreement
Other Matters [Line Items]
One time pre-tax resignation charge to be recognized	$ 0.6	2.8	4.6
Mr. Cole's Agreement | Restatement Adjustment
Other Matters [Line Items]
Final settlement of unearned incentive compensation, clawed back amount		$ 2.2
Final settlement of unearned incentive compensation, clawed back shares		575,127
Gain on final settlement of unearned incentive compensation clawed back		$ 7.3
Mr. Cuneo’s Agreement
Other Matters [Line Items]
One time pre-tax appointment charge to be recognized			$ 1.2