Benefit Plans - Weighted Average Discount Rate (Detail)	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Discount rate			4.87%	5.75%
Expected long-term return on plan assets	7.50%	7.50%	7.50%	8.00%
Rate of compensation increase		2.75%	2.75%	3.25%
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate		4.26%
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate		4.87%