Stock-Based Compensation - Summary of Deferred Tax Benefits Recognized and Tax Benefits Realized to Restricted Stock Awards (Detail) - Restricted Stock [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Deferred tax benefit recognized		$ 76
Tax benefit realized for restricted stock and paid dividends		$ 357
Fair value of vested restricted stock	$ 3,301