Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Line Items]
Change in total valuation allowance	$ 7,287,000	$ 1,754,000	$ 1,048,000
Tax benefits associated with the exercise of SARs and stock options and the vesting of RSUs	5,943,000	6,063,000
Significant unrecognized tax benefits	$ 0	0	0
Income tax examinations, year	2012
Interest and penalties related to uncertain tax positions	$ 0	0	$ 0
Foreign Subsidiaries [Member]
Income Taxes [Line Items]
Earnings related to deferred income tax	8,375,000
Federal and State Capital Loss [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	$ 18,427,000	10,019,000
Net operating loss carryforwards expiration date	2034
Foreign Tax Authority [Member]
Income Taxes [Line Items]
Net operating loss carryforwards	$ 5,932,000	$ 5,642,000
Net operating loss carryforwards expiration date	2035
Acquired Goodwill [Member]
Income Taxes [Line Items]
Useful life (years)	15 years