Employee Benefit Plans (Detail) - Assumptions Used to Determine Accumulated Benefit Obligations	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Retirement Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	4.11%	3.19%
Measurement date	December 31, 2013	December 31, 2012
Post Retirement Benefit Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	3.95%	2.98%
Measurement date	December 31, 2013	December 31, 2012