Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, Beginning	$ (104,061)	$ (7,715)	$ (61,118)	$ (8,440)
Other comprehensive income/(loss) before reclassifications	15,597	(656)	(27,334)	(590)
Amounts reclassified from accumulated other comprehensive income/(loss)	323	202	311	861
Other comprehensive income (loss), net of tax	15,920	(454)	(27,023)	271
Other comprehensive income/(loss), tax expense (benefit)	257	106	115	197
Balance, Ending	(88,141)	(8,169)	(88,141)	(8,169)
Derivative instruments [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, Beginning	1,270	(327)	774	205
Other comprehensive income/(loss) before reclassifications	(780)	(4)	(296)	(1,199)
Amounts reclassified from accumulated other comprehensive income/(loss)	347	206	359	869
Other comprehensive income (loss), net of tax	(433)	202	63	(330)
Balance, Ending	837	(125)	837	(125)
Minimum pension liability adjustment [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, Beginning	(1,819)	(752)	(2,050)	(793)
Other comprehensive income/(loss) before reclassifications	(45)	8	210	53
Amounts reclassified from accumulated other comprehensive income/(loss)	(24)	(4)	(48)	(8)
Other comprehensive income (loss), net of tax	(69)	4	162	45
Balance, Ending	(1,888)	(748)	(1,888)	(748)
Foreign currency translation adjustment [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, Beginning	(103,512)	(6,636)	(59,842)	(7,852)
Other comprehensive income/(loss) before reclassifications	16,422	(660)	(27,248)	556
Amounts reclassified from accumulated other comprehensive income/(loss)	0	0	0	0
Other comprehensive income (loss), net of tax	16,422	(660)	(27,248)	556
Balance, Ending	$ (87,090)	$ (7,296)	$ (87,090)	$ (7,296)