Cash, Cash Equivalents, and Investments - Summary of Cash, Cash Equivalents and Held-to-Maturity Investments by Type (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	$ 90,437	$ 63,395
Gross Unrealized Gains	18	17
Gross Unrealized Losses	(34)	(14)
Fair Value	90,421	63,398
Cash Cash Equivalent And Investments Amortized Cost	48,367	42,271
Short-term Investments	32,774us-gaap_ShortTermInvestments	9,101us-gaap_ShortTermInvestments
Long-term investments	9,296us-gaap_LongTermInvestments	12,023us-gaap_LongTermInvestments
State and Municipal Obligations
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	19,145	10,807
Gross Unrealized Gains	18	14
Gross Unrealized Losses	0	0
Fair Value	19,163	10,821
Cash Cash Equivalent And Investments Amortized Cost	175	45
Short-term Investments	15,891	5,626
Long-term investments	3,079	5,136
Certificates of Deposit
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	2,712	2,619
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	2,712	2,619
Cash Cash Equivalent And Investments Amortized Cost	0	0
Short-term Investments	1,227	2,373
Long-term investments	1,485	246
Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	24,320	12,773
Gross Unrealized Gains	0	3
Gross Unrealized Losses	(34)	(14)
Fair Value	24,286	12,762
Cash Cash Equivalent And Investments Amortized Cost	3,932	5,030
Short-term Investments	15,656	1,102
Long-term investments	4,732	6,641
Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	21,857	13,426
Gross Unrealized Gains	18	14
Gross Unrealized Losses	0	0
Fair Value	21,875	13,440
Cash Cash Equivalent And Investments Amortized Cost	175	45
Short-term Investments	17,118	7,999
Long-term investments	4,564	5,382
Cash
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	44,260	37,196
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	44,260	37,196
Cash Cash Equivalent And Investments Amortized Cost	44,260	37,196
Short-term Investments	0	0
Long-term investments	0	0
Money Market Funds
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	3,932	5,030
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	3,932	5,030
Cash Cash Equivalent And Investments Amortized Cost	3,932	5,030
Short-term Investments	0	0
Long-term investments	0	0
Corporate Bonds
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	20,388	7,743
Gross Unrealized Gains	0	3
Gross Unrealized Losses	(34)	(14)
Fair Value	20,354	7,732
Cash Cash Equivalent And Investments Amortized Cost	0	0
Short-term Investments	15,656	1,102
Long-term investments	$ 4,732	$ 6,641

Cash cash equivalent and investments amortized cost.

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- Definition

This item represents the excess of amortized cost basis over fair value of securities in a gain position and which are categorized as held-to-maturity.

+ References

No definition available.

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- Definition

This item represents the excess of amortized cost basis over fair value of securities in a loss position and which are categorized as held-to-maturity.

+ References

No definition available.

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- Definition

Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

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- Definition

Fair value of investments in debt securities classified as held-to-maturity.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (aa)

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- Definition

The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).

+ References

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- Definition

Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

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