Stockholders' Equity and Noncontrolling Interests - Stock-Based Compensation Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Stock Appreciation Rights
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Beginning balance, shares			335
Forfeited, shares			(269)
Ending balance, shares	66		66
Weighted-Average Grant Date Fair Value, Beginning balance			$ 84.41
Weighted-Average Grant Date Fair Value, Expired			77.90
Weighted-Average Grant Date Fair Value, Ending balance	$ 110.83		$ 110.83
Weighted-average contractual remaining life (in years)			25 days
Exercisable shares	66		66
Weighted-average exercise price			$ 110.83
Weighted-average exercise price exercisable shares	$ 110.83		$ 110.83
Compensation expense (credit)	$ (12,000)	$ (5,000)	$ (15,000)	$ (34,000)
Fair value of liability award	$ 1,000		$ 1,000		$ 33,000
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Beginning balance, shares			10,000
Ending balance, shares	10,000		10,000
Weighted-Average Grant Date Fair Value, Beginning balance			$ 80.05
Weighted-Average Grant Date Fair Value, Ending balance	$ 80.05		$ 80.05
Weighted-average contractual remaining life (in years)			3 years 8 months 1 day
Weighted-average exercise price			$ 80.05
Compensation expense (credit)	$ 20,000	83,000	$ 40,000	284,000
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Beginning balance, shares			18,316
Granted, shares			8,250
Exercised, shares			(18,316)
Ending balance, shares	8,250		8,250
Weighted-Average Grant Date Fair Value, Beginning balance			$ 111.12
Weighted-Average Grant Date Fair Value, Granted			113.19
Weighted-Average Grant Date Fair Value, Exercised			111.12
Weighted-Average Grant Date Fair Value, Ending balance	$ 113.19		$ 113.19
Weighted-average contractual remaining life (in years)			25 days
Weighted-average exercise price			$ 111.12
Compensation expense (credit)	$ 578,000	$ 760,000	$ 941,000	$ 549,000
Fair value of liability award	$ 961,000		$ 961,000		$ 2,426,000