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Commitments - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Schedule Of Contractual Commitments [Line Items]
Expiration of operating lease agreements			Through 2018
Expiration of other contractual obligations			Through 2016
Rent expense	$ 463,000.0	$ 488,000.0	$ 1,400,000	$ 1,500,000

X

- Definition

Expiration of operating lease agreements.

+ References

No definition available.

+ Details

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X

- Definition

Expiration of other contractual obligations.

+ References

No definition available.

+ Details

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- Details

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X

- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

+ Details

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