THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Computation of Basic and Diluted Earnings per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator
Net income	$ 14,020	$ 16,235	$ 40,774	$ 42,190
Less: Income allocated to participating securities	(129)	(141)	(381)	(376)
Net income available to common stockholders	$ 13,891	$ 16,094	$ 40,393	$ 41,814
Denominator
Weighted average shares - basic (in shares)	66,267	65,978	66,188	65,890
Performance-based restricted stock awards (in shares)	0	27	0	25
Weighted average shares - diluted (in shares)	66,267	66,005	66,188	65,915
Basic net income per share
Net income (in usd per share)	$ 0.21	$ 0.24	$ 0.61	$ 0.63
Diluted net income per share
Net income (in usd per share)	$ 0.21	$ 0.24	$ 0.61	$ 0.63