Recent Accounting Pronouncements (Detail)	6 Months Ended
	Jun. 30, 2017
Accounting Standards Update 2017-05
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Standard	ASU 2017-05 Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets
Description	This update clarifies that a financial asset is within the scope of Subtopic 610-20 if it meets the definition of an in-substance nonfinancial asset, including nonfinancial assets transferred within a legal entity to a counterparty. The ASU requires the Company to derecognize a distinct nonfinancial asset or in-substance nonfinancial asset in a partial sale transaction when it ceases to have a controlling financial interest in a legal entity that holds the asset or transfers control of the asset, with any noncontrolling interest retained recognized at fair value. Transfers of ownership interest in a consolidated subsidiary with controlling financial interest retained are accounted for as equity transactions.
Effective Date	Jan. 01, 2018
Effect on the financial statements or other significant matters	Yes
Accounting Standards Update 2017-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Standard	ASU 2017-01 Business Combinations (Topic 805) Clarifying the Definition of a Business
Description	This update provides a screen to determine and a framework to evaluate when a set of assets and activities is a business.
Effective Date	Jan. 01, 2018
Effect on the financial statements or other significant matters	Yes
Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Standard	ASU 2016-13 Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments
Description	This ASU updates the existing incurred loss model to a current expected credit loss ("CECL") model for financial assets and net investments in leases that are not accounted for at fair value through earnings. The amendments affect loans, held-to-maturity debt securities, trade receivables, net investments in leases, off-balance sheet credit exposures and any other financial assets not excluded from the scope. There are also limited amendments to the impairment model for available-for-sale debt securities.
Effective Date	Jan. 01, 2020
Effect on the financial statements or other significant matters	Yes