Employee Benefit Plans (Detail)	12 Months Ended
	Dec. 31, 2015 USD ($) Y	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Pension and Other Postretirement Benefits Disclosure [Abstract]
Minimum Eligible Age For Employees To Contribute To Benefit Plan | Y	21
Employer Match Amount	$ 0.375	$ 0.375	$ 0.375
Employee Contribution Amount	$ 1.00	$ 1.00	$ 1.00
Maximum Percentage of Employee Salary Eligible for Employer Match	6.00%	6.00%	6.00%
401 (k) Expense Recognized by Company	$ 6,100,000	$ 6,200,000	$ 7,800,000