Pension and Employee Benefit Plans - Weighted-average Assumptions Used to Determine Net Periodic Benefit Cost (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.75%	4.50%
Expected return on assets	7.50%	7.50%	7.50%
Compensation increase rate	0.00%	0.00%	0.00%
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate			3.75%
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate			4.50%