Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Deferred tax assets, valuation allowance	$ 700,000	$ 0
Excess tax shortfall (benefit) from exercise of stock options	1,100,000	300,000	$ (1,800,000)
Undistributed earnings of foreign subsidiaries	$ 1,900,000	1,900,000
Likelihood percentage of being realized upon ultimate settlement with the relevant tax authority	50.00%
Unrecognized tax benefits	$ 0	0
Changes in unrecognized benefits	0	$ 0	$ 0
TRS-RenTelco [Member] | Bangalore, India [Member]
Operating Loss Carryforwards [Line Items]
Deferred tax assets, valuation allowance	$ 700,000