STOCK BASED COMPENSATION - Restricted Stock Units Activity (Detail) (USD $)	3 Months Ended
Mar. 31, 2013	Mar. 31, 2013
Number of Units
Outstanding at beginning of period	68,202
Granted	17,300
Released	(12,750)
Forfeited	(500)
Outstanding at end of period	72,252
Exercisable at end of period	0
Weighted Average Remaining Contractual Life (in years)
Outstanding at end of period	3 years 4 months 24 days
Exercisable at end of period	0 years
Aggregate Intrinsic Value
Outstanding at end of period		$ 7,671,717
Exercisable at end of period	$ 0

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Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Exercisable, Intrinsic Value

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other than Options, Exercisable, Number

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Outstanding, Intrinsic Value

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Other Than Options, Exercisable, Weighted Average Remaining Contractual Term

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No definition available.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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- Definition

Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

Number of shares related to Restricted Stock Award forfeited during the period.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 4, 5

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-Publisher SEC

-Name Regulation S-X (SX)

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