Assets Held for Sale (Detail) $ in Thousands, ¥ in Millions	1 Months Ended					3 Months Ended									12 Months Ended
	Nov. 30, 2016 JPY (¥)	Nov. 30, 2016 USD ($)	Oct. 31, 2016 JPY (¥)	Oct. 31, 2016 USD ($)	Feb. 28, 2016 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 JPY (¥)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 29, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of assets, net cash transferred															$ 47,767	$ 851,582	$ 0
Impairment charges												$ 7,700			0	7,698	0
Other current assets												71,800						$ 79,500
Gain (loss) on asset sales															0	32,816	0
Revenues															4,368,428	3,611,989	2,725,867
Net income						$ 65,215	$ 79,900	$ 45,805		$ 42,062	$ 61,750	$ 51,450	$ 44,711	$ (31,111)	$ 232,982	126,800	187,774
Held-for-sale | London 2 (LD2) [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on asset sales																27,900
Revenues																6,100	17,600
Net income																$ 2,300	$ 7,200
Held-for-sale | San Jose Land Parcel
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on asset sales					$ 5,200
Solar Power Assets | Bit-isle
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of assets, net cash transferred	¥ 2,500.0	$ 22,100	¥ 400.0	$ 3,800					¥ 5,313.4	$ 47,800