Cash, Cash Equivalents, and Investments - Summary of Cash, Cash Equivalents and Held-to-Maturity Investments by Type (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	$ 118,305	$ 90,437
Gross Unrealized Gains	11	18
Gross Unrealized Losses	(79)	(34)
Fair Value	118,237	90,421
Cash and Cash Equivalents	59,526	48,367
Short-term investments	50,254	32,774
Long-term investments	8,525	9,296
State and municipal obligations
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	19,002	19,145
Gross Unrealized Gains	11	18
Gross Unrealized Losses	(9)	0
Fair Value	19,004	19,163
Cash and Cash Equivalents	0	175
Short-term investments	12,000	15,891
Long-term investments	7,002	3,079
Certificates of deposit
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	3,371	2,712
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	3,371	2,712
Cash and Cash Equivalents	0	0
Short-term investments	2,577	1,227
Long-term investments	794	1,485
Level 1
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	38,795	24,320
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(70)	(34)
Fair Value	38,725	24,286
Cash and Cash Equivalents	2,389	3,932
Short-term investments	35,677	15,656
Long-term investments	729	4,732
Level 2
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	22,373	21,857
Gross Unrealized Gains	11	18
Gross Unrealized Losses	(9)	0
Fair Value	22,375	21,875
Cash and Cash Equivalents	0	175
Short-term investments	14,577	17,118
Long-term investments	7,796	4,564
Cash
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	57,137	44,260
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	57,137	44,260
Cash and Cash Equivalents	57,137	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	2,389	3,932
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	2,389	3,932
Cash and Cash Equivalents	2,389	3,932
Short-term investments	0	0
Long-term investments	0	0
Corporate bonds
Restricted Cash and Cash Equivalents Items [Line Items]
Amortized Cost	36,406	20,388
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(70)	(34)
Fair Value	36,336	20,354
Cash and Cash Equivalents	0	0
Short-term investments	35,677	15,656
Long-term investments	$ 729	$ 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (a)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 25
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Section 50
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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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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- Definition

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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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