The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period).

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+ Details

Benefit Plans - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended			12 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Pension Benefits [Member]	Dec. 31, 2012 Pension Benefits [Member]	Jun. 30, 2013 Other Benefits [Member]	Dec. 31, 2012 Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Company contribution to employee pension plan			$ 167	$ 167
Company contribution to post retirement life insurance plan					291	295
Profit sharing expense	$ 280	$ 300