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Summary of Significant Accounting Policies - Common Stock Stock Options and Convertible Stock Anti-Dilutive to Earnings Excluded from Weighted Average Shares Used in Computation of Earning Per Share (Detail) shares in Thousands, EquityUnit in Thousands | 12 Months Ended
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Dec. 31, 2016 EquityUnit $ / shares $ / EquityUnit shares | Dec. 31, 2015 EquityUnit $ / shares $ / EquityUnit shares | Dec. 31, 2014 EquityUnit $ / shares $ / EquityUnit shares
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |  |
Weighted average anti-dilutive stock options | shares | 11 | 20 | 23
Weighted average warrants for common stock | shares | 337 |  |
Weighted average PSUs | EquityUnit | 136 | 136 | 100
Weighted average grant date fair value per unit | $ / EquityUnit | 22.17 | 35.35 | 99.40
Weighted average contingently convertible shares | shares | 11,574 |  |
Options |  |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |  |
Weighted average exercise price per share | $ / shares | $ 166.10 | $ 164.75 | $ 164.50
Warrants for Common Stock |  |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |  |
Weighted average exercise price per share | $ / shares | 0.01 |  |
Contingently Convertible Shares |  |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |  |
Weighted average exercise price per share | $ / shares | $ 12.32 |  |

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- Definition Antidilutive securities warrants for common stock, excluded from computation of earnings per share amount. + References No definition available. + Details
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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