Commitments and Contingencies - Additional Information (Detail) (USD $)	Dec. 31, 2012
Future Contractual Minimum Rental Revenues On Leases [Line Items]
Future minimum lease commitments, 2013	$ 821,000
Future minimum lease commitments, 2014	608,000
Future minimum lease commitments, 2015	524,000
Future minimum lease commitments, 2016	466,000
Future minimum lease commitments, 2017	279,000
Future minimum lease commitments, thereafter	$ 28,000

Amount of required minimum rental payments maturing in the next fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the fifth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the forth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the third fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments maturing in the second fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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- Definition

Amount of required minimum rental payments maturing after the fifth fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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