Equity-Based Compensation, Profit Sharing and Deferred Compensation Plans - Summary of Equity-Based Compensation Plans with Grants Outstanding (Parenthetical) (Detail) - shares		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options outstanding		1,076,000	1,096,000
Two Thousand Ten Equity Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares Authorized	[1]	700,000
Shares Available to Issue	[1]	44,000
Two Thousand Ten Equity Plan | RSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares Authorized		240,000
Restricted share units outstanding		16,000	51,000
Shares Available to Issue		38,000
Two Thousand Ten Equity Plan | Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options outstanding		266,000
Shares Available to Issue		44,000
Restricted share units vesting period or Option vesting period		4 years
Options vesting rights		over four years in 25% increments beginning on December 31, 2018
2014 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares Authorized	[2]	950,000
Shares Available to Issue	[2]	269,000
2014 Plan [Member] | Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of options vesting rights		25.00%
Performance metric period		3 years
Restricted share units vesting period or Option vesting period		4 years
Options vesting rights		over four years in 25% increments beginning on December 31, 2016, or later based on the date of grant
2014 Plan [Member] | Options [Member] | Option Grant Solely Contingent upon Continued Employment or Continued Service as a Director
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of options vesting rights		50.00%
2014 Plan [Member] | Options [Member] | Option Grant Contingent upon Continued Employment or Service as a Director and Achievement of Performance Metric
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of options vesting rights		50.00%

[1] During 2010, the Company’s shareholders approved the 2010 Equity Incentive Plan (the “2010 Plan”). The 2010 Plan authorizes the Company to issue Options and RSUs to key management employees, including executive officers and Board members. Of the 700 aggregate shares available to issue, up to 240 may be granted in the form of RSUs. There were 266 Options and 16 RSUs outstanding as of December 31, 2016. Of the 44 shares available to be issued under the 2010 Plan, 38 may be granted as RSUs.

[2] During 2014, the Company’s shareholders approved the 2014 Equity Incentive Plan (the “2014 Plan”). The 2014 Plan authorizes the Company to issue Options to key management employees, including executive officers and Board members. Option grants under the 2014 Plan are generally divided such that vesting for 50% of the Option grant is solely contingent upon continued employment or continued service as a Director, while vesting for the remaining 50% of the Option grant is contingent upon both continued employment or service as a Director and the achievement of a performance metric. The performance metric is based on the Company’s return on capital performance during a specified three year period based on the date of Option grant, with the initial performance period being 2014 through 2016. Options granted under the 2014 Plan vest annually over four years in 25% increments beginning on December 31, 2016, or later based on the date of grant.