Commitments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments and Contingencies Disclosure [Line Items]
Rent expense	$ 58,050us-gaap_LeaseAndRentalExpense	$ 57,226us-gaap_LeaseAndRentalExpense	$ 55,345us-gaap_LeaseAndRentalExpense
Short term committed purchase obligations	44,090
Contribution by employer for employee saving plan	$ 8,262	$ 7,768	$ 7,523
Buildings
Commitments and Contingencies Disclosure [Line Items]
Terms of operating leases expiring year	Dec. 31, 2025
Land
Commitments and Contingencies Disclosure [Line Items]
Terms of operating leases expiring year	Dec. 31, 2057

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Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

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- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Date which lease or group of leases is set to expire, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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Data Type:	xbrli:dateItemType
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- Definition

Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 440

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308

+ Details

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- Details

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- Details

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