Loans and Allowance for Loan Losses - Activity in Allowance for Loan Losses Broken out by Portfolio Segment (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	$ 230,249	$ 167,875	$ 217,613	$ 165,359
Charge-offs	(20,676)	(4,734)	(46,850)	(10,221)
Recoveries	1,261	2,939	6,074	4,627
Provision for loan losses	36,333	26,513	69,674	32,965
Foreign Currency Translation Adjustments	(2,444)	51	(1,788)	(86)
Ending Balance	244,723	192,644	244,723	192,644
Commercial Portfolio Segment \| Software and internet
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	106,898	82,092	103,045	80,981
Charge-offs	(18,055)	(762)	(40,216)	(2,165)
Recoveries	260	597	4,220	1,044
Provision for loan losses	16,215	24,732	37,847	26,869
Foreign Currency Translation Adjustments	(1,089)	69	(667)	(1)
Ending Balance	104,229	106,728	104,229	106,728
Commercial Portfolio Segment \| Hardware
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	23,836	21,258	23,085	25,860
Charge-offs	(2,015)	(839)	(3,501)	(4,049)
Recoveries	183	1,881	422	2,809
Provision for loan losses	2,003	(1,823)	3,962	(4,221)
Foreign Currency Translation Adjustments	(136)	(5)	(97)	73
Ending Balance	23,871	20,472	23,871	20,472
Commercial Portfolio Segment \| Private equity/venture capital
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	43,686	30,837	35,282	27,997
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for loan losses	6,562	(1,557)	14,805	1,381
Foreign Currency Translation Adjustments	(441)	(4)	(280)	(102)
Ending Balance	49,807	29,276	49,807	29,276
Commercial Portfolio Segment \| Life science/healthcare
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	30,285	15,323	36,576	15,208
Charge-offs	(606)	(2,994)	(3,001)	(3,219)
Recoveries	185	45	676	79
Provision for loan losses	12,853	4,846	8,550	5,161
Foreign Currency Translation Adjustments	(865)	13	(949)	4
Ending Balance	41,852	17,233	41,852	17,233
Commercial Portfolio Segment \| Premium wine
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	5,244	4,503	5,205	4,473
Charge-offs	0	0	0	0
Recoveries	0	7	0	7
Provision for loan losses	(465)	(101)	(426)	(71)
Foreign Currency Translation Adjustments	31	0	31	0
Ending Balance	4,810	4,409	4,810	4,409
Commercial Portfolio Segment \| Other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	9,547	6,151	4,252	3,253
Charge-offs	0	(139)	(30)	(788)
Recoveries	599	409	673	556
Provision for loan losses	(714)	(505)	4,431	2,933
Foreign Currency Translation Adjustments	48	(22)	154	(60)
Ending Balance	9,480	5,894	9,480	5,894
Commercial Portfolio Segment \| Commercial loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	219,496	160,164	207,445	157,772
Charge-offs	(20,676)	(4,734)	(46,748)	(10,221)
Recoveries	1,227	2,939	5,991	4,495
Provision for loan losses	36,454	25,592	69,169	32,052
Foreign Currency Translation Adjustments	(2,452)	51	(1,808)	(86)
Ending Balance	234,049	184,012	234,049	184,012
Consumer Portfolio Segment \| Consumer loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning Balance	10,753	7,711	10,168	7,587
Charge-offs	0	0	(102)	0
Recoveries	34	0	83	132
Provision for loan losses	(121)	921	505	913
Foreign Currency Translation Adjustments	8	0	20	0
Ending Balance	$ 10,674	$ 8,632	$ 10,674	$ 8,632

Allowance for Loan and Lease Losses, Loan Recoveries

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- Definition

Amount of gain (loss) from converting allowance reserve for credit loss to currency of reporting entity from amount denominated or measured in a different currency.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Foreign Currency Translation
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 310
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section L
-Subsection 1

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Amount of expense related to loss from loan transactions.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
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