Annual report pursuant to Section 13 and 15(d)

Recent Accounting Standards - Description of Recent Accounting Standards, Not been Adopted (Detail)

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Recent Accounting Standards - Description of Recent Accounting Standards, Not been Adopted (Detail) - Accounting Standards Update 2016-02 - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Description This standard requires a lessee to recognize leases on its balance sheet by recording a liability representing the obligation to make future lease payments and a right-of-use asset representing the right to use the underlying asset for the lease term. A lessee is permitted to make an election not to recognize lease assets and liabilities for leases with a term of 12 months or less. The standard also modifies the definition of a lease and requires expanded disclosures. This standard may be early adopted and must be adopted using a modified retrospective approach with certain available practical expedients, one of which is an option of applying the requirements of the standard either (1) retrospectively to each prior comparative reporting period presented or (2) retrospectively at the beginning of the period of adoption.  
Date of Adoption Jan. 01, 2019  
Effect on our Consolidated Financial Statements or Other Significant Matters The Company has adopted the standard on January 1, 2019, and will apply it at the beginning of the period of adoption. Therefore, upon adoption, financial information and disclosures will not be updated for comparative reporting periods under the new standard. Additionally, the Company has elected the transition package of practical expedients upon adoption which, among other things, allows an entity to not reassess the historical lease classification. The Company utilized a combination of a bottom-up and top-down approach to identify and analyze its lease portfolio. The analysis included reviewing all forms of leases, performing a completeness assessment over the lease population, assessing the policy elections offered by the standard and evaluating its business processes and internal controls to meet the ASU's accounting, reporting and disclosure requirements. The Company’s adoption of the standard has an impact on the Consolidated Balance Sheet. The Company’s adoption of the standard does not impact the Consolidated Statements of Operations or the Consolidated Statements of Cash Flows. The most significant effect of the new standard on the Consolidated Balance Sheet relates to the recognition of right-of-use assets and lease liabilities for the Company’s real estate portfolio, which the Company expects to be between $15 million and $25 million. The Company will also be providing new disclosures for its leasing activities under the new standard in the first quarter of 2019.  
Scenario, Forecast | Subsequent Event | Minimum    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Right-of-use assets   $ 15
Lease liabilities   15
Scenario, Forecast | Subsequent Event | Maximum    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Right-of-use assets   25
Lease liabilities   $ 25