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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 | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Recorded Basis | $ 300,854 | $ 301,118
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 | 4,830 | 21,312
Available-for-sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Recorded Basis | 296,024 | 279,806
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 | 94 | 4
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 | 861 | 2,946
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 | 1,501 | 3,132
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 | 270,099 | 251,892
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 | 3,225 | 2,972
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 | 3,172 | 3,612
Available-for-sale Securities [Member] | Available For Sale Restricted [Member] | Certificates of Deposit [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Recorded Basis | 11,775 | 10,495
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 | 5,297 | 4,753
Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Recorded Basis | 9,023 | 9,976
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 | 9,023 | 9,976
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] | Corporate Bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Recorded Basis | 401 | 2,291
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 | 50 | 241
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 | 888 | 17
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 | 2,174 | 2,285
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 | 213 | 389
Level 1 [Member] | Available-for-sale Securities [Member] | Available For Sale Restricted [Member] | Certificates 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 | 5,297 | 4,753
Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Recorded Basis | 291,831 | 291,142
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 | 4,830 | 21,312
Level 2 [Member] | Available-for-sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Recorded Basis | 287,001 | 269,830
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 | 94 | 4
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 | 460 | 655
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 | 1,451 | 2,891
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 | 269,211 | 251,875
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 | 1,051 | 687
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 | 2,959 | 3,223
Level 2 [Member] | Available-for-sale Securities [Member] | Available For Sale Restricted [Member] | Certificates of Deposit [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Recorded Basis | 11,775 | 10,495
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 | 0
Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Recorded Basis | 0 | 0
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
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
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
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
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
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
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
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
Level 3 [Member] | Available-for-sale Securities [Member] | Available For Sale Restricted [Member] | Certificates of Deposit [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Recorded Basis | 0 | 0
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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