Income Tax - Income Tax Expense Differs from Computed Income Tax at Statutory Rates (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Computed income tax at statutory rates		$ 31,996	$ 29,435	$ (10,109)
Benefit of net tax-exempt interest income		(284)		(180)
Differences in tax rates due to multiple jurisdictions		37	(942)	577
Tax (benefit) expense due to a change in estimate		(201)	(916)	83
Adjustment to deferred taxes due to changes in enacted tax rate and tax grant	$ 1,400		(731)	3,568
Effect of net disallowed operating losses in foreign entities		103	83	93
Effect of income subject to tax-exemption grant		(23,375)	(19,858)	6,242
Unrecognized tax benefit		(11,626)	1,830	1,168
Other		15		(7)
Income tax (benefit) expense		$ (3,335)	$ 8,901	$ 1,435

Income Tax Reconciliation Change In Estimate

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The portion of the differences in tax rates due to multiple jurisdictions.

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- Definition

Income Tax Reconciliation Effect Of Disallowed Net Operating Losses Foreign Operations

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- Definition

Income tax reconciliation effect of income subject to tax-exemption grant.

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Income Tax Reconciliation Tax Exempt Interest Income

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Income tax reconciliation unrecognized tax benefit.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Income Tax Expense (or Benefit)
-URI http://asc.fasb.org/extlink&oid=6515339

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Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Subparagraph 2
-Article 4

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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