Future minimum lease payments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Future Minimum Lease Payments [Line Items]
Capital Leases, Future Minimum Payments Receivable, Current	$ 127,901
Capital Leases, Future Minimum Payments, Receivable in Two Years	112,768
Capital Leases, Future Minimum Payments, Receivable in Three Years	99,531
Capital Leases, Future Minimum Payments, Receivable in Four Years	83,518
Capital Leases, Future Minimum Payments, Receivable Due Thereafter	74,177
Total Minimum Lease Payments	$ 497,895	$ 493,022

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Amount of minimum lease payments to be received by the lessor in the next fiscal year following the latest fiscal year for capital leases.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 4

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=25496975&loc=d3e45377-112738

+ Details

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- Definition

Amount of minimum lease payments to be received by the lessor after the fifth fiscal year following the latest fiscal year for capital leases.

+ References

+ Details

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- Definition

Amount of minimum lease payments to be received by the lessor in the fourth fiscal year following the latest fiscal year for capital leases.

+ References

+ Details

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- Definition

Amount of minimum lease payments to be received by the lessor in the third fiscal year following the latest fiscal year for capital leases.

+ References

+ Details

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- Definition

Amount of minimum lease payments to be received by the lessor in the second fiscal year following the latest fiscal year for capital leases.

+ References

+ Details

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- Definition

Amount of remaining payments as of the balance sheet date that lessees are obligated to make or can be required to make under direct financing leases, including any guarantee of residual value and executory costs. The amount also includes any guaranteed rental payments by an unrelated third-party provided that are financially capable of making such payments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 4

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=25496975&loc=d3e45377-112738

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