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Commitments and Contingencies (Collective Bargaining Agreements) - Additional Information (Detail) - Withdrawal from Multiemployer Defined Benefit Plan [Member] - Central States Plan [Member] - USD ($) $ in Millions		24 Months Ended	40 Months Ended
	Mar. 13, 2013	Sep. 30, 2016	Sep. 30, 2016	Jan. 31, 2016	Jul. 31, 2014	Oct. 09, 2013	Dec. 31, 2011
Loss Contingencies [Line Items]
Amount of withdrawal liability				$ 32.9	$ 39.6		$ 32.6
Payment of withdrawal liability assessment amount		$ 15.9
Acquired Company [Member]
Loss Contingencies [Line Items]
Amount of withdrawal liability				$ 4.8		$ 4.8
Payment of withdrawal liability assessment amount			$ 3.3
Multiemployer plan withdrawal obligation, amount suggested by Plan which is different than amount recorded by company	$ 6.9
Minimum [Member]
Loss Contingencies [Line Items]
Amount of withdrawal liability		40.1	40.1
Maximum [Member]
Loss Contingencies [Line Items]
Amount of withdrawal liability		$ 55.4	$ 55.4

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- Definition

Multiemployer plan withdrawal obligation amount suggested by plan different than amount recorded by company.

+ References

No definition available.

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- Definition

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+ References

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- Definition

Amount of cash outflow reducing loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

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- Definition

Amount of the obligation recognized by withdrawing from a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

No definition available.

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