Stockholders' Equity and Noncontrolling Interests - Common Stock, Amounts Outstanding (Detail) - shares	Mar. 31, 2020	Dec. 31, 2019
Equity [Abstract]
Common stock, shares issued (in shares)	30,832,449	30,832,449
Treasury shares (in shares)	(3,945,249)	(3,945,249)
Common stock, shares outstanding (in shares)	26,887,200	26,887,200
Restricted shares (in shares)	(10,000)	(10,000)
Unrestricted outstanding shares (in shares)	26,877,200	26,877,200