Debt - Additional Information (Detail) $ in Millions	3 Months Ended
Mar. 31, 2016 USD ($)
Debt Instrument [Line Items]
Line of Credit Facility, Fair Value of Amount Outstanding	$ 6.0
Revolving Credit Facility
Debt Instrument [Line Items]
Outstanding stand by letters of credit	5.8
Credit facility available to draw	$ 113.2
Revolving Credit Facility \| London Interbank Offered Rate (LIBOR) \| Minimum
Debt Instrument [Line Items]
Interest rate spread	1.25%
Revolving Credit Facility \| London Interbank Offered Rate (LIBOR) \| Maximum
Debt Instrument [Line Items]
Interest rate spread	1.75%
Revolving Credit Facility \| Base Rate \| Minimum
Debt Instrument [Line Items]
Interest rate spread	0.25%
Revolving Credit Facility \| Base Rate \| Maximum
Debt Instrument [Line Items]
Interest rate spread	0.75%
Revolving Credit Facility \| Federal Fund Rate \| Maximum
Debt Instrument [Line Items]
Interest rate spread	0.50%
Revolving Credit Facility \| Prime Rate [Member] \| Maximum
Debt Instrument [Line Items]
Interest rate spread	1.00%

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

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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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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value of the amount outstanding under the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13476-108611

+ Details

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- Details

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- Details

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- Details

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