Employee and Non-Employee Benefit Plans (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other comprehensive income reclassification of defined benefit plan prior service cost and net actuarial loss	$ 155,000	$ (159,000)
Defined benefit plan, contributions by employer	0
Other comprehensive income (loss), reclassification of net actuarial loss from accumulated other comprehensive loss into pension benefit income	5,000	17,000
Pension contributions	$ 411,000
Common stock, shares authorized (in shares)	40,000,000		40,000,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, equity instruments other than options, nonvested, number (in shares)	949,424