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Net Earnings per Common Share - Additional Information (Detail) - shares shares in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Diluted	[1]	197.2	206.7	213.9
Performance Stock Units [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Diluted		1.0	1.0	1.0
[1] The Company early adopted ASU 2016-09 on a prospective basis as required, related to the recognition of excess tax benefits to the Consolidated Statement of Operations which were previously recorded in additional paid-in capital, effective January 1, 2016. This resulted in an additional 446,747 diluted weighted average number of common shares outstanding for the year ended December 31, 2016, and recognition of excess tax benefits of $18.1 million in the income tax provision for the year ended December 31, 2016. As a result, net earnings per common share increased by $0.10 per share for the year ended December 31, 2016. Refer to Note 2, “Summary of Significant Accounting Policies and Recently Issued Accounting Standards” of the Notes to the Consolidated Financial Statements for further 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.

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- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1505-109256

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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