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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
	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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Antidilutive securities contingently convertible shares excluded from computation of earnings per share amount.

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Antidilutive securities warrants for common stock, excluded from computation of earnings per share amount.

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+ 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

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