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Financial Instruments - Schedule of Cash, Cash Equivalents and Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012 | Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | $ 617,053 | $ 585,909 |  |
Unrealized Gains | 59 | 31 |  |
Unrealized Losses | (1,152) | (207) |  |
Fair Value | 615,960 | 585,733 |  |
Cash and cash equivalents | 200,058 | 367,515 | 478,241 | 183,532
Short-Term Marketable Securities | 196,037 | 118,970 |  |
Long-Term Marketable Securities | 219,865 | 99,248 |  |
Cash [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost, Cash | 154,775 | 141,460 |  |
Unrealized Gains, Cash |  |  |  |
Unrealized Losses, Cash |  |  |  |
Fair Value, Cash | 154,775 | 141,460 |  |
Cash and Cash Equivalents, Cash | 154,775 | 141,460 |  |
Short-Term Marketable Securities, Cash |  |  |  |
Long-Term Marketable Securities, Cash |  |  |  |
Level 1 [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 10,963 | 215,052 |  |
Unrealized Gains |  |  |  |
Unrealized Losses |  |  |  |
Fair Value | 10,963 | 215,052 |  |
Cash and cash equivalents | 10,963 | 215,052 |  |
Short-Term Marketable Securities |  |  |  |
Long-Term Marketable Securities |  |  |  |
Level 1 [Member] | Money market funds [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 10,963 | 215,052 |  |
Unrealized Gains |  |  |  |
Unrealized Losses |  |  |  |
Fair Value | 10,963 | 215,052 |  |
Cash and cash equivalents | 10,963 | 215,052 |  |
Short-Term Marketable Securities |  |  |  |
Long-Term Marketable Securities |  |  |  |
Level 2 [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 451,315 | 229,397 |  |
Unrealized Gains | 59 | 31 |  |
Unrealized Losses | (1,152) | (207) |  |
Fair Value | 450,222 | 229,221 |  |
Cash and cash equivalents | 34,320 | 11,003 |  |
Short-Term Marketable Securities | 196,037 | 118,970 |  |
Long-Term Marketable Securities | 219,865 | 99,248 |  |
Level 2 [Member] | U.S. agency securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 79,048 | 13,634 |  |
Unrealized Gains | 11 | 4 |  |
Unrealized Losses | (126) | (3) |  |
Fair Value | 78,933 | 13,635 |  |
Cash and cash equivalents |  |  |  |
Short-Term Marketable Securities | 29,375 | 7,635 |  |
Long-Term Marketable Securities | 49,558 | 6,000 |  |
Level 2 [Member] | U.S. treasury securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 49,616 |  |  |
Unrealized Gains |  |  |  |
Unrealized Losses | (1) |  |  |
Fair Value | 49,615 |  |  |
Cash and cash equivalents | 34,320 |  |  |
Short-Term Marketable Securities | 15,295 |  |  |
Long-Term Marketable Securities |  |  |  |
Level 2 [Member] | Certificates of deposit [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 23,701 |  |  |
Unrealized Gains |  |  |  |
Unrealized Losses |  |  |  |
Fair Value | 23,729 |  |  |
Cash and cash equivalents |  |  |  |
Short-Term Marketable Securities | 21,127 |  |  |
Long-Term Marketable Securities | 2,602 |  |  |
Level 2 [Member] | Commercial paper [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 15,492 | 48,710 |  |
Unrealized Gains | 4 | 15 |  |
Unrealized Losses |  | (22) |  |
Fair Value | 15,496 | 48,703 |  |
Cash and cash equivalents |  | 9,999 |  |
Short-Term Marketable Securities | 15,496 | 38,704 |  |
Long-Term Marketable Securities |  |  |  |
Level 2 [Member] | Corporate securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 278,457 | 162,050 |  |
Unrealized Gains | 16 | 12 |  |
Unrealized Losses | (1,023) | (180) |  |
Fair Value | 277,450 | 161,882 |  |
Cash and cash equivalents |  | 1,004 |  |
Short-Term Marketable Securities | 109,745 | 67,630 |  |
Long-Term Marketable Securities | 167,705 | 93,248 |  |
Level 2 [Member] | Municipal securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 5,001 | 5,003 |  |
Unrealized Gains |  |  |  |
Unrealized Losses | (2) | (2) |  |
Fair Value | 4,999 | 5,001 |  |
Cash and cash equivalents |  |  |  |
Short-Term Marketable Securities | 4,999 | 5,001 |  |
Long-Term Marketable Securities |  |  |  |

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