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Fair Value Measurement - Summary of Marketable Securities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | $ 300,819 | $ 301,170
Gross Unrealized Gains (Losses) | 35 | (52)
Recorded Basis | 300,854 | 301,118
Marketable Securities Current [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 53,201 | 107,335
Gross Unrealized Gains (Losses) | 0 | 0
Recorded Basis | 53,201 | 107,335
Marketable Securities Current [Member] | Cash and Cash Equivalents [Member] | Money Market Funds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 4,830 | 21,312
Gross Unrealized Gains (Losses) | 0 | 0
Recorded Basis | 4,830 | 21,312
Marketable Securities Current [Member] | Available For Sale Restricted [Member] | Money Market Funds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 48,371 | 76,023
Gross Unrealized Gains (Losses) | 0 | 0
Recorded Basis | 48,371 | 76,023
Marketable Securities Current [Member] | Available For Sale Restricted [Member] | Certificates of Deposit [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 0 | 10,000
Gross Unrealized Gains (Losses) | 0 | 0
Recorded Basis | 0 | 10,000
Marketable Securities Noncurrent [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 247,618 | 193,835
Gross Unrealized Gains (Losses) | 35 | (52)
Recorded Basis | 247,653 | 193,783
Marketable Securities Noncurrent [Member] | Available-for-sale Securities [Member] | Money Market Funds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 94 | 4
Gross Unrealized Gains (Losses) | 0 | 0
Recorded Basis | 94 | 4
Marketable Securities Noncurrent [Member] | Available-for-sale Securities [Member] | Municipal Bonds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 1,500 | 3,135
Gross Unrealized Gains (Losses) | 1 | (3)
Recorded Basis | 1,501 | 3,132
Marketable Securities Noncurrent [Member] | Available-for-sale Securities [Member] | Corporate Bonds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 863 | 2,970
Gross Unrealized Gains (Losses) | (2) | (24)
Recorded Basis | 861 | 2,946
Marketable Securities Noncurrent [Member] | Available For Sale Restricted [Member] | Money Market Funds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 221,728 | 175,869
Gross Unrealized Gains (Losses) | 0 | 0
Recorded Basis | 221,728 | 175,869
Marketable Securities Noncurrent [Member] | Available For Sale Restricted [Member] | Certificates of Deposit [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 11,776 | 496
Gross Unrealized Gains (Losses) | (1) | (1)
Recorded Basis | 11,775 | 495
Marketable Securities Noncurrent [Member] | Available For Sale Restricted [Member] | Municipal Bonds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 3,160 | 3,613
Gross Unrealized Gains (Losses) | 12 | (1)
Recorded Basis | 3,172 | 3,612
Marketable Securities Noncurrent [Member] | Available For Sale Restricted [Member] | Corporate Bonds [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 3,217 | 2,996
Gross Unrealized Gains (Losses) | 8 | (24)
Recorded Basis | 3,225 | 2,972
Marketable Securities Noncurrent [Member] | Available For Sale Restricted [Member] | U.S. Treasuries [Member] |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Cost | 5,280 | 4,752
Gross Unrealized Gains (Losses) | 17 | 1
Recorded Basis | $ 5,297 | $ 4,753

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