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Leases - Additional Information (Detail) $ in Thousands, ¥ in Millions, kr in Millions	1 Months Ended		3 Months Ended		9 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2018 SEK (kr)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Mar. 31, 2018 JPY (¥)
Capital Leased Assets [Line Items]
Payments to acquire lease					$ 136,612	$ 64,964
Financing lease, settled amount					89,655	60,252
Loss on debt extinguishment			$ 1,492	$ (22,156)	$ (39,214)	$ (42,103)
SK2 STOCKHOLM, (METRO), SWEDEN [Member]
Capital Leased Assets [Line Items]
Payments to acquire lease	$ 54,900	kr 457.9
Financing lease, settled amount	28,100	234.5
Loss on debt extinguishment	20,400	kr 170.5
Tokyo 11 (TY11) [Member]
Capital Leased Assets [Line Items]
Capital lease obligation	$ 22,100						¥ 2,348.5
Capital lease obligation, term	30 years						30 years