Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Leases - Additional Information (Detail) $ in Thousands, € in Millions, ¥ in Millions			3 Months Ended		9 Months Ended
	May 15, 2017 EUR (€)	May 15, 2017 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 JPY (¥)	Sep. 30, 2017 USD ($)	May 15, 2017 USD ($)
Capital Leased Assets [Line Items]
Payments to acquire lease					$ 64,964	$ 28,118
Financing lease, settled amount					60,252	100,863
Loss on debt extinguishment			$ (22,156)	$ (9,894)	$ (42,103)	$ (10,499)
Erfpacht [Member]
Capital Leased Assets [Line Items]
Payments to acquire lease	€ 26.7	$ 30,400
AM5 [Member]
Capital Leased Assets [Line Items]
Financing lease, settled amount	20.0	22,800
Loss on debt extinguishment	7.2	$ 8,200
TY5 Tokyo [Member]
Capital Leased Assets [Line Items]
Capital lease obligation							¥ 565.2	$ 72,400
Other assets [Member]
Capital Leased Assets [Line Items]
Ground lease	€ 6.7								$ 7,600