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Future Accounting Matters - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2017 USD ($)
Accounting Standards Update (ASU) 2016-09, Compensation - Stock Compensation [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Tax benefit associated with compensation expense	$ 19,000
Minimum [Member] | Accounting Standards Update (ASU) 2016-02, Leases [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in assets and liabilities	80,000,000
Maximum [Member] | Accounting Standards Update (ASU) 2016-02, Leases [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in assets and liabilities	$ 100,000,000

X

- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The increase (decrease) during the reporting period of all assets and liabilities used in operating activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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- Definition

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+ References

No definition available.

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