Compensation - Activity Associated with Stock Options (Detail) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Roll Forward
Options, Balance outstanding at beginning of period	1,007,085
Granted options	0
Exercised options	0
Forfeited options	0
Options, Balance outstanding at end of period	1,007,085	1,007,085
Number of options exercisable	1,007,085
Weighted-Average Exercise Price, Outstanding at Beginning of Period	$ 10.82
Employee stock option exercise price per share	0
Exercised options, Weighted-Average Exercise Price	0
Forfeited options, Weighted-Average Exercise Price	0
Weighted-Average Exercise Price, Outstanding at End of Period	10.82	$ 10.82
Options exercisable, Weighted-Average Exercise Price	$ 10.82
Weighted-Average Remaining Contractual Term, Options Outstanding	6 months	1 year
Options exercisable, Weighted-Average Remaining Contractual Term	6 months
Aggregate intrinsic value, Options outstanding	$ 548,006	$ 0
Aggregate Intrinsic Value, Options exercisable	$ 548,006