Cash, Cash Equivalents, and Investments - Summary of Cash, Cash Equivalents and Held-to-Maturity Investments by Type (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	$ 104,773us-gaap_HeldToMaturitySecurities	$ 90,437us-gaap_HeldToMaturitySecurities
Gross Unrealized Gains	13	18
Gross Unrealized Losses	(54)	(34)
Fair Value	104,732	90,421
Cash Cash Equivalent And Investments Amortized Cost	46,848	48,367
Short-term investments	43,212us-gaap_ShortTermInvestments	32,774us-gaap_ShortTermInvestments
Long-term investments	14,713us-gaap_LongTermInvestments	9,296us-gaap_LongTermInvestments
State and Municipal Obligations
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	19,108	19,145
Gross Unrealized Gains	13	18
Gross Unrealized Losses	0	0
Fair Value	19,121	19,163
Cash Cash Equivalent And Investments Amortized Cost	681	175
Short-term investments	15,580	15,891
Long-term investments	2,847	3,079
Certificates of Deposit
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	2,950	2,712
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	2,950	2,712
Cash Cash Equivalent And Investments Amortized Cost	0	0
Short-term investments	1,470	1,227
Long-term investments	1,480	1,485
Fair Value, Inputs, Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	38,602	24,320
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(54)	(34)
Fair Value	38,548	24,286
Cash Cash Equivalent And Investments Amortized Cost	2,054	3,932
Short-term investments	26,162	15,656
Long-term investments	10,386	4,732
Fair Value, Inputs, Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	22,058	21,857
Gross Unrealized Gains	13	18
Gross Unrealized Losses	0	0
Fair Value	22,071	21,875
Cash Cash Equivalent And Investments Amortized Cost	681	175
Short-term investments	17,050	17,118
Long-term investments	4,327	4,564
Cash
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	44,113	44,260
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	44,113	44,260
Cash Cash Equivalent And Investments Amortized Cost	44,113	44,260
Short-term investments	0	0
Long-term investments	0	0
Money Market Funds
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	2,054	3,932
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	2,054	3,932
Cash Cash Equivalent And Investments Amortized Cost	2,054	3,932
Short-term investments	0	0
Long-term investments	0	0
Corporate Bonds
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	36,548	20,388
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(54)	(34)
Fair Value	36,494	20,354
Cash Cash Equivalent And Investments Amortized Cost	0	0
Short-term investments	26,162	15,656
Long-term investments	$ 10,386	$ 4,732

Cash cash equivalent and investments amortized cost.

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- Definition

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity.

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Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity.

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

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

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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.

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