Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Line Items]
Provision for income taxes	$ 152,200,000	$ 165,500,000	$ 155,900,000
Federal statutory tax rate	35.00%	35.00%	35.00%
Deferred tax assets expiration date	2033 and 2036
General business credit	$ 10,000,000
Deferred tax general business credits expiration date	2028 and 2036
Uncertain tax positions	$ 6,800,000	$ 0	$ 0	$ 0
Pretax charges (benefits)	0	0	0
Interest accrued	0	$ 0	$ 0
Penalties	$ 0
Statutes of limitations	3 years
Income tax examination period	1 year
Federal [Member]
Income Taxes [Line Items]
Federal and Florida net operating losses (NOL's) carryforward	$ 202,800,000
Florida [Member]
Income Taxes [Line Items]
Federal and Florida net operating losses (NOL's) carryforward	$ 272,600,000