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Fair Value Measurement - Summary of Investments (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | $ 343,937 | $ 304,690
Gross Unrealized Gains (Losses) | 185 | (5)
Recorded Basis | 344,122 | 304,685
Investments Current [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 1,488 | 7,618
Gross Unrealized Gains (Losses) | 1 |
Recorded Basis | 1,489 | 7,618
Investments Current [Member] | Cash and Cash Equivalents [Member] | U.S. Government Agency Debt [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 500 |
Recorded Basis | 500 |
Investments Current [Member] | Cash and Cash Equivalents [Member] | Money Market Funds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 24 | 1,943
Recorded Basis | 24 | 1,943
Investments Current [Member] | Investments [Member] | Municipal Bonds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 320 | 713
Gross Unrealized Gains (Losses) | 1 | 1
Recorded Basis | 321 | 714
Investments Current [Member] | Investments [Member] | Corporate Bonds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 644 | 225
Gross Unrealized Gains (Losses) |  | (1)
Recorded Basis | 644 | 224
Investments Current [Member] | Investments [Member] | Certificates of Deposit [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost |  | 4,737
Recorded Basis |  | 4,737
Investments Noncurrent [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 591 | 643
Gross Unrealized Gains (Losses) | (1) | (1)
Recorded Basis | 590 | 642
Investments Noncurrent [Member] | Investments [Member] | U.S. Treasuries [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 202 |
Recorded Basis | 202 |
Investments Noncurrent [Member] | Investments [Member] | Municipal Bonds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 61 | 76
Recorded Basis | 61 | 76
Investments Noncurrent [Member] | Investments [Member] | Corporate Bonds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 328 | 567
Gross Unrealized Gains (Losses) | (1) | (1)
Recorded Basis | 327 | 566
Investments Noncurrent [Member] | Restricted Cash and Investments [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 341,858 | 296,429
Gross Unrealized Gains (Losses) | 185 | (4)
Recorded Basis | 342,043 | 296,425
Investments Noncurrent [Member] | Restricted Cash and Investments [Member] | Money Market Funds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 26,697 | 284,593
Recorded Basis | 26,697 | 284,593
Investments Noncurrent [Member] | Restricted Cash and Investments [Member] | U.S. Treasuries [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 38,510 | 834
Gross Unrealized Gains (Losses) | (23) |
Recorded Basis | 38,487 | 834
Investments Noncurrent [Member] | Restricted Cash and Investments [Member] | Municipal Bonds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 5,558 | 2,069
Gross Unrealized Gains (Losses) | 28 | (6)
Recorded Basis | 5,586 | 2,063
Investments Noncurrent [Member] | Restricted Cash and Investments [Member] | Corporate Bonds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 144,321 | 2,886
Gross Unrealized Gains (Losses) | 138 | 2
Recorded Basis | 144,459 | 2,888
Investments Noncurrent [Member] | Restricted Cash and Investments [Member] | Certificates of Deposit [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost |  | 6,047
Recorded Basis |  | $ 6,047
Investments Noncurrent [Member] | Restricted Cash and Investments [Member] | Commercial Paper [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 54,554 |
Recorded Basis | 54,554 |
Investments Noncurrent [Member] | Restricted Cash and Investments [Member] | Mortgage Backed Securities [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 72,218 |
Gross Unrealized Gains (Losses) | 42 |
Recorded Basis | $ 72,260 |

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