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Fair Value Measurement - Summary of Investments Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Investments Current [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | $ 56,175 | $ 107,335
Recorded Basis | 56,175 | 107,335
Investments Current [Member] | Cash and Cash Equivalents [Member] | Money Market Funds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 1,943 | 21,312
Recorded Basis | 1,943 | 21,312
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 Current [Member] | Investments [Member] | Municipal Bonds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 713 |
Gross Unrealized Gains (Losses) | 1 |
Recorded Basis | 714 |
Investments Current [Member] | Investments [Member] | Corporate Bonds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 225 |
Gross Unrealized Gains (Losses) | (1) |
Recorded Basis | 224 |
Investments Current [Member] | Restricted Cash and Investments [Member] | Money Market Funds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 48,557 | 76,023
Recorded Basis | 48,557 | 76,023
Investments Current [Member] | Restricted Cash and Investments [Member] | Certificates of Deposit [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost |  | 10,000
Recorded Basis |  | 10,000
Investments Noncurrent [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 304,690 | 301,170
Gross Unrealized Gains (Losses) | (5) | (52)
Recorded Basis | 304,685 | 301,118
Investments Noncurrent [Member] | Investments [Member] | Money Market Funds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost |  | 4
Gross Unrealized Gains (Losses) |  | 0
Recorded Basis |  | 4
Investments Noncurrent [Member] | Investments [Member] | Municipal Bonds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 76 | 3,135
Gross Unrealized Gains (Losses) |  | (3)
Recorded Basis | 76 | 3,132
Investments Noncurrent [Member] | Investments [Member] | Corporate Bonds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 567 | 2,970
Gross Unrealized Gains (Losses) | (1) | (24)
Recorded Basis | 566 | 2,946
Investments Noncurrent [Member] | Restricted Cash and Investments [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 248,515 | 193,835
Gross Unrealized Gains (Losses) | (5) | (52)
Recorded Basis | 248,510 | 193,783
Investments Noncurrent [Member] | Restricted Cash and Investments [Member] | Money Market Funds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 236,036 | 175,869
Recorded Basis | 236,036 | 175,869
Investments Noncurrent [Member] | Restricted Cash and Investments [Member] | Certificates of Deposit [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 6,047 | 496
Gross Unrealized Gains (Losses) |  | (1)
Recorded Basis | 6,047 | 495
Investments Noncurrent [Member] | Restricted Cash and Investments [Member] | Municipal Bonds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 2,069 | 3,613
Gross Unrealized Gains (Losses) | (6) | (1)
Recorded Basis | 2,063 | 3,612
Investments Noncurrent [Member] | Restricted Cash and Investments [Member] | Corporate Bonds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 2,886 | 2,996
Gross Unrealized Gains (Losses) | 2 | (24)
Recorded Basis | 2,888 | 2,972
Investments Noncurrent [Member] | Restricted Cash and Investments [Member] | U.S. Treasuries [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 834 | 4,752
Gross Unrealized Gains (Losses) |  | 1
Recorded Basis | $ 834 | $ 4,753

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