Stockholders' Equity and Noncontrolling Interests - Common Stock, Amounts Outstanding (Detail) - shares	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity [Abstract]
Shares issued	30,832,449	30,832,449	30,832,449
Treasury shares	(3,945,249)	(3,947,000)	(3,900,565)
Outstanding shares	26,887,200	26,885,449	26,931,884
Restricted shares	(10,000)	(10,000)	(74,000)
Unrestricted outstanding shares	26,877,200	26,875,449	26,857,884