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Debt Obligations (Credit Facility - prior to 4/1/14 information - Additional Information (Detail) - Prior to 4/1/14 [Member]	12 Months Ended
	Dec. 31, 2016
Line of Credit Facility [Line Items]
Commitment fee	0.20%
Excess of Eurocurrency Rate Applicable to Domestic Borrowings Only [Member]
Line of Credit Facility [Line Items]
Debt Instrument Basis Spread On Variable Rate	1.25%
Excess of Base Rate Domestic Borrowings Only [Member]
Line of Credit Facility [Line Items]
Debt Instrument Basis Spread On Variable Rate	0.25%
Excess of Euro Currency Rate of Credit Agreement for Foreign Borrowings [Member]
Line of Credit Facility [Line Items]
Debt Instrument Basis Spread On Variable Rate	1.25%
Standby Letters of Credit [Member]
Line of Credit Facility [Line Items]
Debt Instrument Basis Spread On Variable Rate	1.25%
Performance Letters of Credit [Member]
Line of Credit Facility [Line Items]
Debt Instrument Basis Spread On Variable Rate	0.75%

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: