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Fair Value Measurements - Summary of Assets Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	$ 301,118	$ 244,291
Cash and Cash Equivalents [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	21,312	17,110
Available-for-sale Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	279,806	227,181
Available-for-sale Securities [Member] | Available For Sale Unrestricted [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	4	0
Available-for-sale Securities [Member] | Available For Sale Unrestricted [Member] | Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	3,132	3,850
Available-for-sale Securities [Member] | Available For Sale Unrestricted [Member] | Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	2,946	2,150
Available-for-sale Securities [Member] | Available For Sale Unrestricted [Member] | Certificate of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	0	23,217
Available-for-sale Securities [Member] | Available For Sale Unrestricted [Member] | Variable Rate Demand Notes (VRDN) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	0	21,670
Available-for-sale Securities [Member] | Available For Sale Restricted [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	251,892	50,202
Available-for-sale Securities [Member] | Available For Sale Restricted [Member] | Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	3,612	4,373
Available-for-sale Securities [Member] | Available For Sale Restricted [Member] | Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	2,972	2,127
Available-for-sale Securities [Member] | Available For Sale Restricted [Member] | Certificate of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	10,495	115,745
Available-for-sale Securities [Member] | Available For Sale Restricted [Member] | U.S. Treasuries [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	4,753	3,847
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	9,976	5,592
Level 1 [Member] | Cash and Cash Equivalents [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	0	0
Level 1 [Member] | Available-for-sale Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	9,976	5,592
Level 1 [Member] | Available-for-sale Securities [Member] | Available For Sale Unrestricted [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	0	0
Level 1 [Member] | Available-for-sale Securities [Member] | Available For Sale Unrestricted [Member] | Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	241	355
Level 1 [Member] | Available-for-sale Securities [Member] | Available For Sale Unrestricted [Member] | Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	2,291	1,681
Level 1 [Member] | Available-for-sale Securities [Member] | Available For Sale Unrestricted [Member] | Certificate of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	0	0
Level 1 [Member] | Available-for-sale Securities [Member] | Available For Sale Unrestricted [Member] | Variable Rate Demand Notes (VRDN) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	0	0
Level 1 [Member] | Available-for-sale Securities [Member] | Available For Sale Restricted [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	17	0
Level 1 [Member] | Available-for-sale Securities [Member] | Available For Sale Restricted [Member] | Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	389	236
Level 1 [Member] | Available-for-sale Securities [Member] | Available For Sale Restricted [Member] | Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	2,285	1,698
Level 1 [Member] | Available-for-sale Securities [Member] | Available For Sale Restricted [Member] | Certificate of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	0	0
Level 1 [Member] | Available-for-sale Securities [Member] | Available For Sale Restricted [Member] | U.S. Treasuries [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	4,753	1,622
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	291,142	238,699
Level 2 [Member] | Cash and Cash Equivalents [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	21,312	17,110
Level 2 [Member] | Available-for-sale Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	269,830	221,589
Level 2 [Member] | Available-for-sale Securities [Member] | Available For Sale Unrestricted [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	4	0
Level 2 [Member] | Available-for-sale Securities [Member] | Available For Sale Unrestricted [Member] | Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	2,891	3,495
Level 2 [Member] | Available-for-sale Securities [Member] | Available For Sale Unrestricted [Member] | Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	655	469
Level 2 [Member] | Available-for-sale Securities [Member] | Available For Sale Unrestricted [Member] | Certificate of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	0	23,217
Level 2 [Member] | Available-for-sale Securities [Member] | Available For Sale Unrestricted [Member] | Variable Rate Demand Notes (VRDN) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	0	21,670
Level 2 [Member] | Available-for-sale Securities [Member] | Available For Sale Restricted [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	251,875	50,202
Level 2 [Member] | Available-for-sale Securities [Member] | Available For Sale Restricted [Member] | Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	3,223	4,137
Level 2 [Member] | Available-for-sale Securities [Member] | Available For Sale Restricted [Member] | Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	687	429
Level 2 [Member] | Available-for-sale Securities [Member] | Available For Sale Restricted [Member] | Certificate of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	10,495	115,745
Level 2 [Member] | Available-for-sale Securities [Member] | Available For Sale Restricted [Member] | U.S. Treasuries [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	0	2,225
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	0	0
Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	0	0
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	0	0
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | Available For Sale Unrestricted [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	0	0
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | Available For Sale Unrestricted [Member] | Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	0	0
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | Available For Sale Unrestricted [Member] | Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	0	0
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | Available For Sale Unrestricted [Member] | Certificate of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	0	0
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | Available For Sale Unrestricted [Member] | Variable Rate Demand Notes (VRDN) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	0	0
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | Available For Sale Restricted [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	0	0
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | Available For Sale Restricted [Member] | Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	0	0
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | Available For Sale Restricted [Member] | Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	0	0
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | Available For Sale Restricted [Member] | Certificate of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	0	0
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] | Available For Sale Restricted [Member] | U.S. Treasuries [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total Recorded Basis	$ 0	$ 0

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+ References

No definition available.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Trading Securities
-URI http://asc.fasb.org/extlink&oid=6526789

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 35
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Available-for-Sale Securities
-URI http://asc.fasb.org/extlink&oid=6505594

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 1
-Subparagraph a, f, g
-Article 7

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