Schedule of Changes in Beginning Stockholders' Equity (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Apr. 01, 2017	Mar. 31, 2017
Balance	$ 632,482	$ 529,152	$ 452,071
Common stock, Outstanding	44,271,905		43,673,286
Cumulative effect of adoption of new accounting standard		77,081
Common Stock
Balance		$ 437	$ 437
Common stock, Outstanding		43,673,286	43,673,286
Treasury Stock
Balance		$ (46,763)	$ (46,763)
Common stock, Outstanding		1,575,995	1,575,995
Additional Paid in Capital
Balance		$ 567,797	$ 565,962
Cumulative effect of adoption of new accounting standard		1,835
Accumulated Deficit
Balance		28,287	(46,959)
Cumulative effect of adoption of new accounting standard		75,246
Accumulated Other Comprehensive Income (Loss)
Balance		$ (20,606)	$ (20,606)