Summary of Future Purchase Obligations and Minimum Rental Commitments for Leasehold Properties and Operating Leases with Non-Cancelable Terms (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Other Commitments [Line Items]
2015	$ 4,503
2016	1,838
2017	879
2018	691
Operating Leases, Future Minimum Payments Due, Total	7,911
Minimum rental commitments for leasehold properties
Other Commitments [Line Items]
2015	1,018
2016	938
2017	879
2018	691
Operating Leases, Future Minimum Payments Due, Total	3,526
Commitments for other lease obligations
Other Commitments [Line Items]
2015	2,537
2016	900
Operating Leases, Future Minimum Payments Due, Total	3,437
Other purchase obligations
Other Commitments [Line Items]
2015	948
Operating Leases, Future Minimum Payments Due, Total	$ 948

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 55

-Paragraph 40

-Subparagraph (Note 3)

-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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