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Fair Value of Financial Instruments and Concentration of Credit Risk - Additional Information (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Concentration Risk [Line Items]
Cash and cash equivalents	$ 93,557,000	$ 45,747,000	$ 49,571,000	$ 30,924,000
Credit Concentration Risk [Member] | Tax-exempt Money Market Funds [Member]
Concentration Risk [Line Items]
Cash and cash equivalents	66,300,000
Credit Concentration Risk [Member] | Variable Rate Demand Notes (VRDN) [Member]
Concentration Risk [Line Items]
Marketable securities	10,000,000
Credit Concentration Risk [Member] | Municipal Bonds [Member]
Concentration Risk [Line Items]
Marketable securities	$ 8,800,000

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5



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-Name Accounting Standards Codification

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