Income Taxes - Additional Information (Detail)	9 Months Ended
Sep. 30, 2016
Income Tax Disclosure [Abstract]
Income tax examination description	As of September 30, 2016, the Company is under routine examination by the New York State Department of Taxation and Finance for the 2013, 2014 and 2015 income tax years. The Company does not believe, but cannot predict with certainty whether, there will be any additional tax liabilities, penalties and/or interest as a result of the audit. During the nine months ended September 30, 2016, the Illinois Department of Revenue completed an audit of the Company’s corporate income tax returns for the tax years ended December 31, 2013 and 2012 and proposed no changes. Therefore, the Company does not expect any additional tax liabilities, penalties and/or interest as a result of the audit.

Income Taxes - Additional Information (Detail)

9 Months Ended

Sep. 30, 2016

As of September 30, 2016, the Company is under routine examination by the New York State Department of Taxation and Finance for the 2013, 2014 and 2015 income tax years. The Company does not believe, but cannot predict with certainty whether, there will be any additional tax liabilities, penalties and/or interest as a result of the audit. During the nine months ended September 30, 2016, the Illinois Department of Revenue completed an audit of the Company’s corporate income tax returns for the tax years ended December 31, 2013 and 2012 and proposed no changes. Therefore, the Company does not expect any additional tax liabilities, penalties and/or interest as a result of the audit.