Stockholders' Equity and Noncontrolling Interests - Common Stock, Amounts Outstanding (Detail) - shares	Sep. 30, 2015	Dec. 31, 2014
Stockholders' Equity Note [Abstract]
Shares issued	30,832,449	30,832,449
Treasury shares	(3,940,947)	(3,960,507)
Outstanding shares	26,891,502	26,871,942
Restricted shares	(76,000)	(142,667)
Unrestricted outstanding shares	26,815,502	26,729,275