Employee Benefits (Detail) - Benefit Plans and Related Amounts Recorded in Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Projected benefit obligation	$ 35,870	$ 38,115	$ 34,585	$ 31,605
Plan assets at fair value	(13,190)	(13,220)	(13,870)
Funded status – shortfall	22,680	24,895	20,715
Amounts recorded in the Consolidated Balance Sheets for the plans:
Other liabilities — accrued pension obligation	22,680	24,895	20,715
Stockholders’ equity — deferred actuarial loss	$ (4,832)	$ (6,028)	$ (1,811)