Indebtedness - Schedule of Principal Maturities of Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
2017	$ 828,584
2018	841,356
2019	619,759
2020	178,824
2021	197,925
Thereafter	913,957
Total	3,580,405	$ 2,753,746
Recourse Debt Excluding Convertible Senior Notes [Member]
Debt Instrument [Line Items]
2017	563,017
2018	131,564
2019	781
2020	14,994
2021	2,326
Thereafter	7,149
Total	719,831
Non-recourse debt [Member]
Debt Instrument [Line Items]
2017	265,567
2018	479,792
2019	52,978
2020	50,830
2021	195,599
Thereafter	906,808
Total	1,951,574	$ 1,242,249
Convertible senior notes [Member]
Debt Instrument [Line Items]
2018	230,000
2019	566,000
2020	113,000
Total	$ 909,000

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth 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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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