Components of Net Periodic Benefit Cost - Additional Information (Detail)	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2006	Dec. 31, 2002
Compensation and Retirement Disclosure [Abstract]
Defined benefit plan age of attainment	21 years
Service period for employees of coverage age, years	1 year
Defined benefit plan, percentage vested	100.00%
Retiree benefits eliminated if less than service period, years	10 years	10 years	10 years